Develop Bugs

[Q] Text messages and calls not being received

I've been having a problem with receiving texts sometimes and I recently noticed that it happens with call apparently. The issue is that I'm texting people back and forth and then all of a sudden I wont receive messages for a long time (couple hours). At some point, someone's text message will push through all of the other ones all at the same time. Sometimes when I assume i'm having this issue, I will send a text to myself and it will push the other ones through as well. Recently though I was made aware that during this "outage", I also was not able to receive phone calls at all. The signal is strong at all times (3-4 bars). Also happens when I'm home all day and not changing locations when it will suddenly stop getting texts and calls. Does anyone know how to fix this issue? I restarted the phone and changed cell towers with the Airplane mode many times and the issue continues to happen at random times. It is really inconvenient. Suggestions?
Technical details: I use the stock 4.1.1 Rom that comes with AT&T S3. I do have LTE in my area.

And now it has happened 3 days in a row but at different times of day. This is a huge problem for me as I use my phone a lot. Any help would be appreciated

You still have your IMEI number via settings -> about phone -> status?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

ARPLEMODE
TRy making sure yiur not in airplane mode. i was stuck in airplane for a week ._____________.:cyclops:

That's weird. Re-seat your SIM card, if that doesn't do anything then take a trip to your nearest AT&T store/dealer and have them swap out your SIM card and see if it still occurs after that.

I had a similar problem a while back and it happened to be a network problem with my carrier. Gave them a call and all is fine now.
Sent from my SGH-I747 using xda app-developers app

fafik90 said:
I've been having a problem with receiving texts sometimes and I recently noticed that it happens with call apparently. The issue is that I'm texting people back and forth and then all of a sudden I wont receive messages for a long time (couple hours). At some point, someone's text message will push through all of the other ones all at the same time. Sometimes when I assume i'm having this issue, I will send a text to myself and it will push the other ones through as well. Recently though I was made aware that during this "outage", I also was not able to receive phone calls at all. The signal is strong at all times (3-4 bars). Also happens when I'm home all day and not changing locations when it will suddenly stop getting texts and calls. Does anyone know how to fix this issue? I restarted the phone and changed cell towers with the Airplane mode many times and the issue continues to happen at random times. It is really inconvenient. Suggestions?
Technical details: I use the stock 4.1.1 Rom that comes with AT&T S3. I do have LTE in my area.
Click to expand...
Click to collapse
It happend to me too. I went to att store and get new sim. No problem for last 15-20 days. Looks like i got stronger signal too.

Just to give anyone interested in this an update:
I went to the AT&T store today and told them my issue so they told me to go to the nearest AT&T device support center (which was really far away). People over there told me they heard about this issue many times over the past couple of months. The guy working there had a S3 and said he has the same problem. They received an email from the higher-ups this morning specifically talking about this random outage thing I have and that they are currently working on it. They were told to not exchange phones or sim cards because of this since it wont help. The issue involves a combination of Network and Jelly Bean software problems and happens on all new LTE devices that have Jelly Bean from AT&T. They told me to check periodically if there is a solution.
I guess I just gotta wait. Unless someone recommends a ROM that is not based on the latest AT&T jelly bean?

Bumping it up, both me and my wife have had this happen. From what im read its a pretty widespread deal.
Anyone know of a work around at least until they fix it?

Keep us updated
Same problem here - switched from Verizon to AT&T last month and started noticing this problem a few weeks ago. Back then a Google search didn't find much on it, but this thread looks promising.
Just to add my two cents: I'm on a rooted S3 with task650's AOKP (4.2.1) build 12.23.2012 (link). Made sure to flash the modem for my phone (I747UCLI5 from here). Problem: phone randomly won't receive calls or texts. Sometimes calling someone will fix it.
I read somewhere that on AT&T, calls and texts are received over 3G and sometimes phones have difficulty switching from 4G. Anyone know if this is true?

Do a full wipe /system, /data, /cache, /dalvik cache. And your problems should be gone 9 times out of 10 that's usually everybodys problem
Sent from the scary door....

fafik90 said:
I've been having a problem with receiving texts sometimes and I recently noticed that it happens with call apparently. The issue is that I'm texting people back and forth and then all of a sudden I wont receive messages for a long time (couple hours). At some point, someone's text message will push through all of the other ones all at the same time. Sometimes when I assume i'm having this issue, I will send a text to myself and it will push the other ones through as well. Recently though I was made aware that during this "outage", I also was not able to receive phone calls at all. The signal is strong at all times (3-4 bars). Also happens when I'm home all day and not changing locations when it will suddenly stop getting texts and calls. Does anyone know how to fix this issue? I restarted the phone and changed cell towers with the Airplane mode many times and the issue continues to happen at random times. It is really inconvenient. Suggestions?
Technical details: I use the stock 4.1.1 Rom that comes with AT&T S3. I do have LTE in my area.
Click to expand...
Click to collapse
I had this same problem except it would only happen on WiFi.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

thatsupnow said:
Do a full wipe /system, /data, /cache, /dalvik cache. And your problems should be gone 9 times out of 10 that's usually everybodys problem
Sent from the scary door....
Click to expand...
Click to collapse
Tried that no go, plus its on 2 different phones.
Found some more info and ended up adding anothe APN and chaning some info in it seems good now.

mrmooney said:
Tried that no go, plus its on 2 different phones.
Found some more info and ended up adding anothe APN and chaning some info in it seems good now.
Click to expand...
Click to collapse
Care to share what you did that fixed it?

fafik90 said:
Care to share what you did that fixed it?
Click to expand...
Click to collapse
Yeah more info here.
http://forums.att.com/t5/Android-Di...ing-Calls-Phone-issue-or-Android/m-p/3404809#
Seems to still be working fine.

I started a thread on this also and just yesterday received some info from AT&T tech.
http://forum.xda-developers.com/showthread.php?t=2123974

guys,
it is an ATT issue,
here is a temp solution for a fix:
1) With phone on, take off back cover and press your SIM card so it releases from the spring. It won't come all the way out as it's blocked by the battery. This seems fine - I didn't bother trying to force it out as I didn't want to break anything...
2) Once you see the message that the SIM card is removed, go to the dialer and dial *#2263#
3) You should see a menu with band selections. The current setting is "Automatic". If you switch to "GSM All", you will be EDGE (2G). If you switch to "WCDMA All", you will be on HSPA+ (3G, though AT&T and others call it 4G).
4) Press the SIM card back into place until it clicks. For whatever reason the phone will not recognize it until you reboot. Upon reboot you should see your new setting in effect
please see, post, comment here:
http://forums.att.com/t5/Android-Di...ls-Phone-issue-or-Android/td-p/3270741/page/3

[Q] JB, cant sms or use 3g.

Hey, i have just installed the newest MIUI Australia 3.1.11v2 on my HOX, and i have one simple problem.
At first nothing worked, but after a few reinstallations, the only thing not working now is sms and data.
I can make calls, recieve calls and recieve sms's, but i can't send any sms's myself, and i cant get on the internet unless using wifi.
I updated my hboot to 1.39, and if there is anything else you need just ask
Hope someone can help me.
Ridick2602

Ridick2602 said:
Hey, i have just installed the newest MIUI Australia 3.1.11v2 on my HOX, and i have one simple problem.
At first nothing worked, but after a few reinstallations, the only thing not working now is sms and data.
I can make calls, recieve calls and recieve sms's, but i can't send any sms's myself, and i cant get on the internet unless using wifi.
I updated my hboot to 1.39, and if there is anything else you need just ask
Hope someone can help me.
Ridick2602
Click to expand...
Click to collapse
Had sort of issues like you. Did everything to fix it. Turned out my SIM couldn't register on the network of my operator (2g all fine, 3g mess up). If you call the support of your operator, they can look it up. Had to get a replacement SIM.
Try disable 3g and send a sms to someone, when I had 3g on it wouldn't deliver the sms. As soon it was disabled it could.
Not saying you got the same, but most of the issues you report are very familiar with what I got in past.

Braindamage1989 said:
Had sort of issues like you. Did everything to fix it. Turned out my SIM couldn't register on the network of my operator (2g all fine, 3g mess up). If you call the support of your operator, they can look it up. Had to get a replacement SIM.
Try disable 3g and send a sms to someone, when I had 3g on it wouldn't deliver the sms. As soon it was disabled it could.
Not saying you got the same, but most of the issues you report are very familiar with what I got in past.
Click to expand...
Click to collapse
Well just tried to disable the data, but it didn't work. I just cant see why the problem should be caused by the sim since it worked fine with another rom yestaday?

Ridick2602 said:
Well just tried to disable the data, but it didn't work. I just cant see why the problem should be caused by the sim since it worked fine with another rom yestaday?
Click to expand...
Click to collapse
It started with rooting the device by me. When I got the device I left it stock without root for 4 weeks, after that week I started to get this problem. From one on the other day. It didn't make sense at all.
I serious spent 5 months to fix this, I had made radio changes, RIL changes, ROM changes, removing root, had contact with services centers, had contact with operator, had contact with HTC and none of them worked or could provide a solution. Untill I got a (smart) girl on the phone at the operator support who told me to get a new sim card to see if the phone would register at the network then.
Thats why I say this to you, as none acctually knows what went wrong and you have exact same issues as me. In case you spent so much time to find it out while someone could have a solution available.

[Q] Fixes yet for calls going straight to voicemail?

I have searched for over 2 weeks now online for a fix, I am on phone number 3 and sim card number 3. My phone, at least once a day, send all phone calls to straight to voicemail (showing no missed calls), texts do not come in etc. When this is happening, I show full bars and 4G. My wife is using my old Galaxy S and her works fine (not the network being down). If I restart my phone, I will get my missed texts and voicemails and I will receive calls as normal for a little time.
I have factory reset several times, as above, I am on my 3rd phone (2nd refurb that was probably sent back for this issue), 3rd sim card, I make sure I'm not in airplane mode, auto block calls are off, call forwarding is off, not connected to WiFi calling.
I am at my whits end, I'm about to send this great Galaxy S3 back and switch to maybe a Nexus 4 (granted I've seen all JB phones with this same issue) to see if I can just get a phone that works...like a phone.
Has anyone figured out yet why this occurs? Alot of people said it started with the upgrade to JB. Has anyone found a fix for this thing?
Also, would rooting and tossing on a custom rom fix this?
Please help, thanks in advance!

Geisty said:
I have searched for over 2 weeks now online for a fix, I am on phone number 3 and sim card number 3. My phone, at least once a day, send all phone calls to straight to voicemail (showing no missed calls), texts do not come in etc. When this is happening, I show full bars and 4G. My wife is using my old Galaxy S and her works fine (not the network being down). If I restart my phone, I will get my missed texts and voicemails and I will receive calls as normal for a little time.
I have factory reset several times, as above, I am on my 3rd phone (2nd refurb that was probably sent back for this issue), 3rd sim card, I make sure I'm not in airplane mode, auto block calls are off, call forwarding is off, not connected to WiFi calling.
I am at my whits end, I'm about to send this great Galaxy S3 back and switch to maybe a Nexus 4 (granted I've seen all JB phones with this same issue) to see if I can just get a phone that works...like a phone.
Has anyone figured out yet why this occurs? Alot of people said it started with the upgrade to JB. Has anyone found a fix for this thing?
Also, would rooting and tossing on a custom rom fix this?
Please help, thanks in advance!
Click to expand...
Click to collapse
I would trying odin with the latest stock ICS image. See if that helps first! Its UVALJ4....heres the link
http://forum.xda-developers.com/showthread.php?t=1949687

mattedwards2686 said:
I would trying odin with the latest stock ICS image. See if that helps first! Its UVALJ4....heres the link
http://forum.xda-developers.com/showthread.php?t=1949687
Click to expand...
Click to collapse
I could give that a try, but I really don't want to go back in versions, I love JB and don't see the point in wasting money on a new phone when I could have gotten one for free or cheaper that uses ICS.

Thanks
I was having the same issue. However, mine was just blocking one person. I check under the persons contact info, you can hit menu and select reject calls. I then checked under Call Settings (press menu while on the dialer), first option is Call rejection. You can turn this option on or off and add or remove numbers here. Hope this helps someone.

[SOLVED] Can't receive calls.....but I can make them? (very detailed thread)

I'm having a VERY specific issue with my ATT M8 that I can't seem to figure out. First and foremost, I've tried wiping all partitions and starting over....with 3 different ROMS (Liquid, Candy5, Bliss Pop) and none of them allow me to RECEIVE calls. I've even done an RUU back COMPLETELY to stock everything using the ATT stock Lollipop RUU image. When I boot the stock RUU I can again receive calls. Below is the detailed info on the scenario....
Can't receive calls but I'm notified if someone leaves a voice mail.
Making calls from my phone works fine.
If I'm on the phone and someone calls me the phone notifies me like it normally would.
When someone tries to call me, they hear it ring the proper number of times and it does NOT go straight to voice mail.
That last bullet is VERY important. The fact the call doesn't go straight to voice mail is an indication the ATT network knows my phone is indeed powered on and available. Strangely though, it doesn't ring or do anything to otherwise show someone is trying to call.
At this point I'm really stumped. How on Earth is this even possible? Especially after doing the RUU and having the phone work as intended only to try and flash any other ROM later and have it not receive calls. I'm 100% stumped and really need y'alls help.!
**SOLUTION BELOW**
Apparently AT&T is rolling out HD Voice in many areas. It's basically voice over LTE and it's not compatible with many custom ROMS. This is why flashing the stock AT&T RUU made everything work just fine but when I tried ANY custom ROM it wouldn't work.
If this happens to you try the following....disable LTE by turning off mobile data or simply switching to 3G. Then try to call yourself or have someone call you. If the call comes through on your handset it's due to HD Voice having been activated on your account. I called AT&T and explained that I needed HD Voice turned off for my account. You'll likely have to talk to tech support. Ask them when it was activated on your account. Mine was activated last week which is the EXACT time I started having issues. The AT&T tech will ask that you power down the phone whilst they make the changes. Then turn your phone back on (with LTE active) and try a test call. It should work for you.
Big thanks to @redpoint73 for helping me figure this out!

I'm wondering if after doing the RUU my radio or something isn't at a proper level. Attached is a screenshot of my current bootloader. Anyone see something out of the ordinary that needs updating?

Yeah, I would go ahead and check with ATT if there are any bars on your account. Sounds like more of a network issue than a phone issue.

downbringer said:
Yeah, I would go ahead and check with ATT if there are any bars on your account. Sounds like more of a network issue than a phone issue.
Click to expand...
Click to collapse
Thanks for the reply! What would lead you to believe it's a network issue? I can make calls just fine and if I'm on the phone and someone calls me it works as if it normally would. Only issue is when someone calls me and I'm NOT on the phone.

Try turning off LTE, and see if you can get calls.
Some folks have been having issues with "international" based Sense ROMs not playing well with AT&T's LTE network upgrades (in preparation for Voice Over LTE). Not sure if this affects AOSP ROMs, but I have a feeling this is the problem.

redpoint73 said:
Try turning off LTE, and see if you can get calls.
Some folks have been having issues with "international" based Sense ROMs not playing well with AT&T's LTE network upgrades (in preparation for Voice Over LTE). Not sure if this affects AOSP ROMs, but I have a feeling this is the problem.
Click to expand...
Click to collapse
Wow......You, you're good you lol. @redpoint73
Sooooo yeah, changing my mobile data to 3G all of a sudden allows calls to come through. What exactly is at play here and how do I fix it?

italynstylion said:
What exactly is at play here and how do I fix it?
Click to expand...
Click to collapse
As I already described, AT&T is upgrading their LTE network for Voice Over LTE (they call it "HD Voice") and something in that upgrade doesn't seem to be playing well for some people on international based custom ROMs. In addition to voice call problems, you will probably also find SMS messages won't work on LTE.
Curiously, the problem seems to be very location specific. I've been running Skydragon Sense and LeeDroid for a few months, and on AT&T network. And everything has been working fine for me at my home location, as well as a few other locations around the country (I travel pretty occasionally for work). These are some of the ROM that others have had AT&T LTE issues with; and at one point even in the same city as another user that was suffering this issue (Chicago area). But for me, everything seemed to work fine.
The only real fix is to go back to stock AT&T based ROM. Folks have tried to flash various radios, and other things with no luck. Team Venom (Viper ROM) also said they would look into it a few months ago; but I don't think anything ever came of that.
An ingenious workaround posted by another user (if you want to stay on an international ROM): call AT&T and ask them to turn off HD Voice for your account. So you can still use LTE for data, but the call bug won't occur.
Of course, the downside for this is that you won't be able to utilize HD Voice. But that is probably the lesser of evils, if you want to stay on the current ROM.

redpoint73 said:
As I already described, AT&T is upgrading their LTE network for Voice Over LTE (they call it "HD Voice") and something in that upgrade doesn't seem to be playing well for some people on international based custom ROMs.
The only real fix is to go back to stock AT&T based ROM. Folks have tried to flash various radios, and other things with no luck.
An ingenious workaround posted by another user (if you want to stay on an international ROM): call AT&T and ask them to turn off HD Voice for your account. So you can still use LTE for data, but the call bug won't occur.
Of course, the downside for this is that you won't be able to utilize HD Voice. But that is probably the lesser of evils, if you want to stay on the current ROM.
Click to expand...
Click to collapse
This is brilliant. I'll give it a shot. Thanks for your help!

italynstylion said:
This is brilliant. I'll give it a shot. Thanks for your help!
Click to expand...
Click to collapse
I agree, its a good workaround. Especially since HD Voice requires users on both ends of the call to have a phone that supports the feature; and few phones for the time being have it. So having HD Voice turned off on your account (even if its deployed in your area) is probably mostly irrelevant.
You're quite welcome. And if you have a chance, please click the "Thanks" button for any posts you found helpful!

redpoint73 said:
I agree, its a good workaround. Especially since HD Voice requires users on both ends of the call to have a phone that supports the feature; and few phones for the time being have it. So having HD Voice turned off on your account (even if its deployed in your area) is probably mostly irrelevant.
You're quite welcome. And if you have a chance, please click the "Thanks" button for any posts you found helpful!
Click to expand...
Click to collapse
Just got off the phone with AT&T and everything is just peachy again. I updated the first post with the solution/fix. Thanks so much for your help!

italynstylion said:
Ask them when it was activated on your account. Mine was activated last week which is the EXACT time I started having issues.
Click to expand...
Click to collapse
Interesting. I wonder if HD Voice hasn't been activated on my account yet; and that is why I haven't had this issue while others have?

redpoint73 said:
Interesting. I wonder if HD Voice hasn't been activated on my account yet; and that is why I haven't had this issue while others have?
Click to expand...
Click to collapse
It's certainly possible. I live in Dallas which is a fairly large area. It wouldn't surprise me if we were one of the areas that got it first. Sucks being a guinea pig but I've left a trail of breadcrumbs for everyone else to follow.

italynstylion said:
It's certainly possible. I live in Dallas which is a fairly large area. It wouldn't surprise me if we were one of the areas that got it first. Sucks being a guinea pig but I've left a trail of breadcrumbs for everyone else to follow.
Click to expand...
Click to collapse
I'm in Boston area, and according to the AT&T maps, HD Voice is working here.
Although, I got the M8 long before it supported the feature (they added it with the 4.4.4 OTA). So I don't know how they decide when to activate it on your account; but if its device related, I can see how it might not be on mine yet.

italynstylion said:
I'm having a VERY specific issue with my ATT M8 that I can't seem to figure out. First and foremost, I've tried wiping all partitions and starting over....with 3 different ROMS (Liquid, Candy5, Bliss Pop) and none of them allow me to RECEIVE calls. I've even done an RUU back COMPLETELY to stock everything using the ATT stock Lollipop RUU image. When I boot the stock RUU I can again receive calls. Below is the detailed info on the scenario....
Can't receive calls but I'm notified if someone leaves a voice mail.
Making calls from my phone works fine.
If I'm on the phone and someone calls me the phone notifies me like it normally would.
When someone tries to call me, they hear it ring the proper number of times and it does NOT go straight to voice mail.
That last bullet is VERY important. The fact the call doesn't go straight to voice mail is an indication the ATT network knows my phone is indeed powered on and available. Strangely though, it doesn't ring or do anything to otherwise show someone is trying to call.
At this point I'm really stumped. How on Earth is this even possible? Especially after doing the RUU and having the phone work as intended only to try and flash any other ROM later and have it not receive calls. I'm 100% stumped and really need y'alls help.!
**SOLUTION BELOW**
Apparently AT&T is rolling out HD Voice in many areas. It's basically voice over LTE and it's not compatible with many custom ROMS. This is why flashing the stock AT&T RUU made everything work just fine but when I tried ANY custom ROM it wouldn't work.
If this happens to you try the following....disable LTE by turning off mobile data or simply switching to 3G. Then try to call yourself or have someone call you. If the call comes through on your handset it's due to HD Voice having been activated on your account. I called AT&T and explained that I needed HD Voice turned off for my account. You'll likely have to talk to tech support. Ask them when it was activated on your account. Mine was activated last week which is the EXACT time I started having issues. The AT&T tech will ask that you power down the phone whilst they make the changes. Then turn your phone back on (with LTE active) and try a test call. It should work for you.
Big thanks to @redpoint73 for helping me figure this out!
Click to expand...
Click to collapse
Thanks for the post this helped me with my issue!!!

Have any of you tried to disable enhanced 4G LTE Mode in network settings instead of slowing you down to 3g?
goo.gl/photos/BX9N2b37Z2Wb1UeQA
[/QUOTE]
italynstylion said:
I'm having a VERY specific issue with my ATT M8 that I can't seem to figure out. First and foremost, I've tried wiping all partitions and starting over....with 3 different ROMS (Liquid, Candy5, Bliss Pop) and none of them allow me to RECEIVE calls. I've even done an RUU back COMPLETELY to stock everything using the ATT stock Lollipop RUU image. When I boot the stock RUU I can again receive calls. Below is the detailed info on the scenario....
Can't receive calls but I'm notified if someone leaves a voice mail.
Making calls from my phone works fine.
If I'm on the phone and someone calls me the phone notifies me like it normally would.
When someone tries to call me, they hear it ring the proper number of times and it does NOT go straight to voice mail.
That last bullet is VERY important. The fact the call doesn't go straight to voice mail is an indication the ATT network knows my phone is indeed powered on and available. Strangely though, it doesn't ring or do anything to otherwise show someone is trying to call.
At this point I'm really stumped. How on Earth is this even possible? Especially after doing the RUU and having the phone work as intended only to try and flash any other ROM later and have it not receive calls. I'm 100% stumped and really need y'alls help.!
**SOLUTION BELOW**
Apparently AT&T is rolling out HD Voice in many areas. It's basically voice over LTE and it's not compatible with many custom ROMS. This is why flashing the stock AT&T RUU made everything work just fine but when I tried ANY custom ROM it wouldn't work.
If this happens to you try the following....disable LTE by turning off mobile data or simply switching to 3G. Then try to call yourself or have someone call you. If the call comes through on your handset it's due to HD Voice having been activated on your account. I called AT&T and explained that I needed HD Voice turned off for my account. You'll likely have to talk to tech support. Ask them when it was activated on your account. Mine was activated last week which is the EXACT time I started having issues. The AT&T tech will ask that you power down the phone whilst they make the changes. Then turn your phone back on (with LTE active) and try a test call. It should work for you.
Big thanks to @redpoint73 for helping me figure this out!
Click to expand...
Click to collapse

phgojiya said:
Have any of you tried to disable enhanced 4G LTE Mode in network settings instead of slowing you down to 3g?
goo.gl/photos/BX9N2b37Z2Wb1UeQA
Click to expand...
Click to collapse
[/QUOTE]
What ROM are you on? I dont have that option to turn off enhanced LTE on my network settings page

grafik2 said:
What ROM are you on? I dont have that option to turn off enhanced LTE on my network settings page
Click to expand...
Click to collapse
If you are on AT&T and suffering this problem, my advice would be to call AT&T and ask them to turn off HD Voice on your account. The enhanced LTE setting on the phone does nothing to help this problem.

redpoint73 said:
If you are on AT&T and suffering this problem, my advice would be to call AT&T and ask them to turn off HD Voice on your account. The enhanced LTE setting on the phone does nothing to help this problem.
Click to expand...
Click to collapse
Gotcha.
i had this happen to me once months ago maybe even a year ago and i called and they turned HD voice off and it worked. it started happening again last week I wonder if ATT reapplied the HD voice setting for some reason

italynstylion said:
I'm having a VERY specific issue with my ATT M8 that I can't seem to figure out. First and foremost, I've tried wiping all partitions and starting over....with 3 different ROMS (Liquid, Candy5, Bliss Pop) and none of them allow me to RECEIVE calls. I've even done an RUU back COMPLETELY to stock everything using the ATT stock Lollipop RUU image. When I boot the stock RUU I can again receive calls. Below is the detailed info on the scenario....
Can't receive calls but I'm notified if someone leaves a voice mail.
Making calls from my phone works fine.
If I'm on the phone and someone calls me the phone notifies me like it normally would.
When someone tries to call me, they hear it ring the proper number of times and it does NOT go straight to voice mail.
That last bullet is VERY important. The fact the call doesn't go straight to voice mail is an indication the ATT network knows my phone is indeed powered on and available. Strangely though, it doesn't ring or do anything to otherwise show someone is trying to call.
At this point I'm really stumped. How on Earth is this even possible? Especially after doing the RUU and having the phone work as intended only to try and flash any other ROM later and have it not receive calls. I'm 100% stumped and really need y'alls help.!
**SOLUTION BELOW**
Apparently AT&T is rolling out HD Voice in many areas. It's basically voice over LTE and it's not compatible with many custom ROMS. This is why flashing the stock AT&T RUU made everything work just fine but when I tried ANY custom ROM it wouldn't work.
If this happens to you try the following....disable LTE by turning off mobile data or simply switching to 3G. Then try to call yourself or have someone call you. If the call comes through on your handset it's due to HD Voice having been activated on your account. I called AT&T and explained that I needed HD Voice turned off for my account. You'll likely have to talk to tech support. Ask them when it was activated on your account. Mine was activated last week which is the EXACT time I started having issues. The AT&T tech will ask that you power down the phone whilst they make the changes. Then turn your phone back on (with LTE active) and try a test call. It should work for you.
Big thanks to @redpoint73 for helping me figure this out!
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Thank you so much! I've been looking everywhere for a solution after I installed the Resurrection Remix Rom 5.7.4 on a replacement HTC M8 that I bought new. Love these now 3+ year old phones but not recieving phone calls was crazy. I thought I would be forced to go back to stock.

Can't receive calls, but can make calls and texts

Just happened yesterday out of nowhere. On AT&T, but there's no HD call coverage here in Honolulu, so that wasn't the problem. People calling me goes straight to voicemail, but I can make calls and texts and receive texts. Thought it was a rom issue, so I did a clean flash on the most recent SD rom, but no luck. Kind of out of ideas now

GSE20 said:
Just happened yesterday out of nowhere. On AT&T, but there's no HD call coverage here in Honolulu, so that wasn't the problem. People calling me goes straight to voicemail, but I can make calls and texts and receive texts. Thought it was a rom issue, so I did a clean flash on the most recent SD rom, but no luck. Kind of out of ideas now
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There was a rash of posts by folks not receiving calls/texts all over the AT&T forum a month or 2 ago. Pretty sure that instance was network related. If you didn't change anything on the phone (like you said "out of nowhere") I'm guessing the same is true in this case.

redpoint73 said:
There was a rash of posts by folks not receiving calls/texts all over the AT&T forum a month or 2 ago. Pretty sure that instance was network related. If you didn't change anything on the phone (like you said "out of nowhere") I'm guessing the same is true in this case.
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i had the same. they enabled HDVoice which is their voice over LTE branding. It doesnt work with non AT&T roms. I got into with them on the phone. they said they couldn't turn it off. i called in a few times. it sounded like complete BS, but the tier 2 person created a tag & escalated it up. It just started working a day later.
you can go into your phones hidden settings for the time being & turn off 4G. It sucks, but at least your calls come through