Develop Bugs

Missing Calls Frequently

So, I am curious if anyone else has this issue. I have 3 EVO's (all launch day) and 3 Heros (bought at the same time as the EVO's). All Heros are rooted and running Fresh Toast Rom. One EVO (mine) is running EvolutionX (Froyo). The other 2 Evo's are stock, non rooted.
All phones are occasionally missing calls. They do not even show in the call log. I have tested it. I called my phone (which was 2 inches from me) from my office and nothing. It just rings until it goes to voice mail, but the EVO does not ring at all. This happens on all the phones. Outbound calls work fine on the phone when this happens, though. I can call a landline and it goes through, but can not receive calls. It lasts about 5-30 minutes.
Any ideas?

Bad service in your area? Check to make sure your phone is set to cdma auto

rutter9 said:
Bad service in your area? Check to make sure your phone is set to cdma auto
Click to expand...
Click to collapse
I am in South Florida, one of Sprints strongest areas. I always have at least 3 bars of service. So it is definitely not a low service.
the thing is, it only happens every now and then and in random places. It is not like it only does not work in my house or office. I have been all over town and it happen in random places. It happens on all the phones at the same time.........could be a by product of sprint upgrading in the area?

Network completely dropping randomly?

This is happening multiple times a day, randomly.
Ironically, I was at a vzw corporate store today getting a half off extended battery and incipio case, and it happened, i was driving home in the middle of a bluetooth call and it dropped, and while at work it drops every 10 minutes.
What the heck is going on? It even drops at my house, where i have "-93dBm" of 4G service... the notification bars will start at full 4G to none, grayed out.
This is extremely annoying and making my phone "work" a lot, thus killing the battery. It didn't make it through a 12 hour day today being in my pocket about 7/8ths of the time!!

al2x said:
This is happening multiple times a day, randomly.
Ironically, I was at a vzw corporate store today getting a half off extended battery and incipio case, and it happened, i was driving home in the middle of a bluetooth call and it dropped, and while at work it drops every 10 minutes.
What the heck is going on? It even drops at my house, where i have "-93dBm" of 4G service... the notification bars will start at full 4G to none, grayed out.
This is extremely annoying and making my phone "work" a lot, thus killing the battery. It didn't make it through a 12 hour day today being in my pocket about 7/8ths of the time!!
Click to expand...
Click to collapse
I just exchanged my Nexus a couple of days ago, because of this exact issue. So far, I haven't had a single random network drop on the new Nexus.
(Tech support suggested going to a VZW store and having them swap the SIM card out, so I did. As soon as I made it back out to my car, the network dropped again. As I was walking into the Target across the street, it dropped again, so I turned around and went back to the VZW store. They swapped the phone out.)

YES. Had no problems until today (at least that I've noticed). Now its not getting any data. I get strong 4G at my house too. Right now its saying I have 3G but its not giving me any data connection despite what the icon says. Might have to take it back

I had no problem until today. This morning the network dropped out suddenly and hasn't come back. Plugging it in, pulling battering, switching all data settings (LTE/3G, roaming, etc) has no effect. I may be taking a trip down to the Verizon store over my lunch break...

There is an issue with Verizon 3G/4G data right now, it seems to be down nationwide.

I live in Arizona / Phoenix and am experiencing the same. I have no data (3g or 4g) and haven't since my commute into work today. It's frustrating. This isn't a Verizon 3G/4G data issue nationwide. My coworker next to me is using a Droid Bionic and has both 3G and 4G working fine. We just loaded up several sites on her phone. I'm starting to get peeved.

iamsupreme said:
I live in Arizona / Phoenix and am experiencing the same. I have no data (3g or 4g) and haven't since my commute into work today. It's frustrating. This isn't a Verizon 3G/4G data issue nationwide. My coworker next to me is using a Droid Bionic and has both 3G and 4G working fine. We just loaded up several sites on her phone. I'm starting to get peeved.
Click to expand...
Click to collapse
Yep another co-worker with a verizon phone also has data coverage while mine has been skipping out this morning.
That being said, this is not a scientific poll since 99% of the people posting here have GN phones. Are there any reports of problems in the other forums?

Though several articles, this one being one (http://www.gottabemobile.com/2011/12/28/verizon-suffering-another-nationwide-4g-lte-outage/) are showing that there is, in fact, another nationwide 4g LTE outage. Maybe her Bionic just switches to 3G properly and my Nexus isn't? I changed it from LTE/CDMA to CDMA and powered off and on the radio. No luck.

iamsupreme said:
Though several articles, this one being one (http://www.gottabemobile.com/2011/12/28/verizon-suffering-another-nationwide-4g-lte-outage/) are showing that there is, in fact, another nationwide 4g LTE outage. Maybe her Bionic just switches to 3G properly and my Nexus isn't? I changed it from LTE/CDMA to CDMA and powered off and on the radio. No luck.
Click to expand...
Click to collapse
Thanks for that. My data just came back up and it's 3G only now and seems solid. Perhaps Verizon has taken down their LTE network to prevent phones from trying to connect to it until they resolve the problem.

I'm getting a 3G icon when I turn off LTE/CDMA and put it at CDMA only. But actually trying to load anything with data (web, Facebook, YouTube) doesn't work. No connectivity.

Yeah, Droidlife reported on the outage for ALL 4G phones. My Thunderbolt is also affected. This is one of the reasons why my paranoid self is happy that I have two phones: one on T-Mo and one on Verizon.

Called VZ, data down in Miami. Phone is heating up like a mf, good 'cause it's freaking cold here like 68

lioryte said:
Called VZ, data down in Miami. Phone is heating up like a mf, good 'cause it's freaking cold here like 68
Click to expand...
Click to collapse
I want to live somewhere where my big problem with the weather is that it's 68 degrees. Anyway, glad to hear it's a network issue and not my phone.

Random signal drops in Baltimore as well. Especially after a phone call. On second phone and still same issue.
Sent from my Galaxy Nexus using Tapatalk

Here in Rhode Island, I lost all signal for about 4 minutes, had 3g for about 5 minutes, then got 4g on and off for about 5-10 minutes.
As of now i'm solid 4g with no disconnect or 3g
its probably because of that 3.7+ MILLION devices activated for christmas
be glad we don't have RIM with a 3 day blackout

Yeah, and the problem with the GNex is that, unlike other phones, it doesn't seem to have a "no 4g, only 3g" capability, so when 4G goes down, we have no data whatsoever. Older phones that can switch LTE off are able to hook onto 3G.

SomeGuyDude said:
Yeah, and the problem with the GNex is that, unlike other phones, it doesn't seem to have a "no 4g, only 3g" capability, so when 4G goes down, we have no data whatsoever. Older phones that can switch LTE off are able to hook onto 3G.
Click to expand...
Click to collapse
Very very much untrue.
Sent from my Galaxy Nexus

SomeGuyDude said:
Yeah, and the problem with the GNex is that, unlike other phones, it doesn't seem to have a "no 4g, only 3g" capability, so when 4G goes down, we have no data whatsoever. Older phones that can switch LTE off are able to hook onto 3G.
Click to expand...
Click to collapse
Settings > More... > Mobile networks > Network Mode > Select CDMA (default is LTE/CDMA) > Profit

its a nationwide issue affecting SOME LTE Verizon users.
http://www.droid-life.com/2011/12/28/verizon-4g-lte-nationwide-data-outage-happening-once-again/

I was in a costco this afternoon and it wasn't working. I originally assumed it was the metal building. Nope, Verizon's network again.

[Q] Sprint GSIII Voice and Text problems

Hi Guys,
I have a brand new GSIII 32 gig. I live in Chicago (No LTE). I'm on the Sprint CDMA network. I have 3g Data.
My connection bars will fluctuate constantly from near full signal, to 1 bar, to no bars, to near full signal, to Roaming, out roaming, full signal, etc. I cannot make a phone call or send a text. But, I have successfully placed a call when the phone happens to be in its "roaming phase".
Note that this has happened to me on another device: http://forum.xda-developers.com/showthread.php?t=1025108
I've updated the PRL and the profile several times. I've done a hard reset of the phone...
What is happening? Tech support has been completely unhelpful. They claim that there are some open tickets in my area for towers blocking voice (and text). But, my wife and brother have the same phones (though my wife's is 16gig) and theirs work fine (same carrier, same family plan)...
Any thoughts, suggestions, things to try?
Best,
Eamon

I've been in and out as well and I'm in Colorado so it might just be tower upgrades going on or something . No clue though lol
Sent from my SPH-L710 using xda premium

What I don't understand is why my wife and brother have working phones on the same tower. This is obviously a problem with provisioning my # but who can I talk to about this?? Customer support simply tries phone resets and prl updates.

Dropping Calls on Sprint Galaxy S3

Just got my S3, and I'm dropping calls in areas where my SE4GT didn't. The calls are either dropping, or are 'breaking up', in the words of multiple people at different phone numbers I'm calling.
The common denominator is that the Calls start off strong, and then within seconds, start to break up then drop.
Maybe the device has to be held a certain way, as with the iPhone. Just throwing that out there, as I don't know.
I'm still trying to isolate the issue.
I've read that this is happening to others, and may be a radio problem.
I just don't want to exchange device if this is a wide spread device issue, which appears to be undetermined yet.
Update:
After calling the same number from my Sprint number, and having the calls (5) fade and drop off within seconds, I called the same number from my GV #, and the call was successful. The call lasted over 1 1/2 hrs. without issue.
Imo, the above rules out an S3 issue, and the issue is with Sprint and the Network, or the Network/Switch of the person I'm calling, in regards to how their Network is handling the Call from the Sprint number.

For what it's worth, I haven't had any such issues with my sprint s3, signal strength in much of my town is sketchy.

Maybe certain S3's had an issue, and I need to exchange mine.
I'm uncertain at this point, as I just got the S3 on Tues.
Please see the Update in the OP.

My gf and I have the same issue. Ive dropped more calls with this phone than the entire 6 years ive been with sprint. Its the samsung radios. Not sure about returning it and getting another unit since it happens in my gfs as well. Its frustrating, my phone also roams in my house which has always had close to a full signal on every other phone ive owned including the epic touch 4g.
Sent from my SPH-L710 using xda premium

Dropping calls as well. My friend too. The radios suck on this phone, so if you're in a marginal coverage area, you'll be dropping more calls with the S3.

kronium said:
Dropping calls as well. My friend too. The radios suck on this phone, so if you're in a marginal coverage area, you'll be dropping more calls with the S3.
Click to expand...
Click to collapse
I'm dropping calls in areas I didn't have trouble with my SE4GT.
On a side more, I'm not too happy with the camera on my S3, compared to my SE4GT.
On the S3, indoor pics are not as sharp, and are grainy, and the flash washes out the pics.
I thought the dropping call issue may be either:
- Hardware related
- Sprint testing of towers preparing for LTE
- a lemon S3
Regarding the camera issues, I thought may be:
- hardware related, and issue is with all the S3's
- a lemon
Because of the uncertainty regarding the causes of the above, even after extensive searching, I've decided to exchange my S3 for another S3, since I'm within my 14 day return/exchange period.
If the above issue or issues are resolved, then I just had a 'bad' S3.
If the issues aren't resolved, then:
- I got another lemon, which would be doubtful
- or these issues are inherent to all S3's
Hopefully at least one of the issues will be resolved.
I'd rather not switch devices, as I've got my current S3 just right regarding apps, programming, etc.
But I had to try another S3.
If neither issue is resolved with the replacement S3, maybe a future update will resolve one of these issues.
I'll see how it goes with the replacement.
I'd hate to see that the S3 has issues which the SE4GT never had. That's a step backwards, and if true, I most likely made the wrong decision to exchange my S3, and should have just returned it, and reactivated my SE4GT.
Hopefully though, the exchange will make a difference.
I have:
Hardware version:
L710.14
Does anyone know what the current hardware version is, if it has been updated?

I had the same issue with mine, poor signal, but even with the signal reported as ridiculously low I can still place a call.
I exchanged my first phone and thought the new phone was better, the Sprint store has the cell tower in the parking lot so it's hard to tell.
The first thing the phone did when I got home was update software, so I don't know how it would have worked before but after that my signal has remained poor.
I have tried all the other modems and not seen a measurable difference from one to the next.
Also my indicated signal strength vary around wildly swinging from lows below -220 to highs of -90 at home.
Other times closer to a tower I am getting -75, but it falls of very quickly.

This dropping of calls is getting really anoying. It's happening everywhere I didn't have issues with the SE4GT. It's like I know when I make a call, that I'm gonna hear the other side say, "I can't hear you, you're fading out!"
I thought GV solved it, I thought maybe it's a fluke. But the bottomline is, I'm fading and then dropping calls.
I'm thinking it's an internal antenna issue, andd holding the phone a certain way matters ala the iPhone.
But I'm not sure what the issue is, except that it IS an issue.
Is it Sprint working on the Towers?
Is it the LTE Radio in the S3?
I'm hoping the replacement fixes this crap, But I'm not so sure.

i drop quite a few calls as well in areas that i did not previously before. I am also getting alot of failed call attempts and have to redial the number a 2nd or 3rd time to make the call go through... not sure whats up with that.

if you are refering to making a call and it conects for a second then ends the call.
this is a known issue with sprints network and the samsung galaxy and the nexus lte line of phones
IE the S2, Nexus, LTE, and S3.
Sprint knows about this and is supposedly working on it.
(i have seen this problem with INTL GSM phones but i cant speak to there issue as its a total different radio and software)
IMPO it is an issue with the phones radios and software trying to talk to sprints network and getting booted or disconnecting.
IE its the Little seceret your not suposed to know about
(it affects Making 911 calls to)

My SE4GT hardly had any dropped calls.
My current S3 drops them like crazy.
Multiple times daily from different areas.
I can call from the same location in my room and have multiple fading of the call, then it drops.
I then call again, and it's fine.
This is usually how it goes:
- a call is made
- after a minute or so, the called party says I'm fading.
- I move around, I hold the phone differently, and the called party says ok, I can hear you.
- a few seconds later the called party says hello multiple times, and then says I can't hear you.
- the called party just hangs up the call in disgust, or the call drops
*The interesting thing is that before the call is dropped, and the called party says I'm fading, I can still hear them fine.
Maybe this is a clue to what the issue may be.
Hopefully it's a defective device, and my replacement will fair better. I'll see in a few days.
I say this because my SE4GT worked perfectly, while others dropped calls, from what I've read.

S3 Coverage, Phone / Network Problems - NYC Area
Im in the NYC area and dropping calls all over the place including on the Hutchinson River Pkwy, Henry Hudson Pkwy, Merritt Pkwy, etc.
I'm now testing my replacement and so far it looks like the radio in this phone is garbage on Sprint's network compared to every other Sprint phone I've had going back 5 years. I'll be back in NYC on Monday so I'll try the replacement then but within my home my coverage has evaporated with this phone however another Sprint model is working 100% here (both phones showing 1 bar).
My guess is that this phone is going to fade away on Sprint pretty quickly with the exception of users staying within local metro areas where hand-offs are going to be more limited as they won't be able to support the troubles with it.

I received my replacement S3, and still have the same issues, as I thought I probably would.
I installed the LG8 modem, as it had the LG2 modem as the last one did, so I'll see how that goes,
Looks like a stronger signal, but I'll know for sure shortly.

Biker1 said:
I received my replacement S3, and still have the same issues, as I thought I probably would.
I installed the LG8 modem, as it had the LG2 modem as the last one did, so I'll see how that goes,
Looks like a stronger signal, but I'll know for sure shortly.
Click to expand...
Click to collapse
Let me know if you find a fix. I'd rather stay with Sprint if possible.

trehouse said:
Let me know if you find a fix. I'd rather stay with Sprint if possible.
Click to expand...
Click to collapse
I definitely will

I just found this app:
Network Signal Info
https://play.google.com/store/apps/details?id=de.android.telnet&hl=en
It won't make your signal stronger, but it'll give you some important signal info, in addition to other device info, with a quick look. Includes a really nice widget.

kronium said:
Dropping calls as well. My friend too. The radios suck on this phone, so if you're in a marginal coverage area, you'll be dropping more calls with the S3.
Click to expand...
Click to collapse
If my phone continues to drop calls I'll be dropping Sprint. Ive got almost a week left on my 14 day trial. I love the phone but it just won't be with this carrier.

I'm still on LG8, and will know if it resolved the dropping call issues by early next week, and if the cause was LG2.
I don't know why the cause of the dropping of calls has not been addressed by Sprint or Samsung yet.
It appears to be an issue that was not an issue with the Samsung Epic 4G Touch.
What's going on?
I hope it is a Modem issue.
We'll see.
I'm not seeing a whole lot about this issue on the web, or on xda, unless I missed the discussions.

Confirmed Fix:
As mentioned previously, I flashed the LG8 Modem from LG2. This has resolved my dropped call issue in at least one area where I was consistently dropping calls since I received my S3. This is Fantastic news for me!
I'm in the -70's into the -60's dB range in the area I am now getting great reception in.
I didn't check the signal dB previously, but was dropping calls All the time in this location.
I have not made many calls from other areas I was dropping calls in as of yet. I'll update when I see how other previous trouble areas are.
LG8 has worked very nicely for me.
Obviously ymmv, depending on your location.
Battery efficiency is the same as before, which has been very good.
Update:
Still dropping calls all over the place, except in the area stated above.
I have never had such horrendous dropped call issues in the 14+ years of cell phone usage. At least none that come to mind as wiht e S3.
I already have a trouble ticket filed, but it is to check a tower in one area. I drop calls all over the place.
My 2nd S3, new contract, etc.
This bites Big Time!

Biker1 said:
Confirmed Fix:
As mentioned previously, I flashed the LG8 Modem from LG2. This has resolved my dropped call issue in at least one area where I was consistently dropping calls since I received my S3. This is Fantastic news for me!
I'm in the -70's into the -60's dB range in the area I am now getting great reception in.
I didn't check the signal dB previously, but was dropping calls All the time in this location.
I have not made many calls from other areas I was dropping calls in as of yet. I'll update when I see how other previous trouble areas are.
LG8 has worked very nicely for me.
Obviously ymmv, depending on your location.
Battery efficiency is the same as before, which has been very good.
Update:
Still dropping calls all over the place, except in the area stated above.
I have never had such horrendous dropped call issues in the 14+ years of cell phone usage. At least none that come to mind as wiht e S3.
I already have a trouble ticket filed, but it is to check a tower in one area. I drop calls all over the place.
My 2nd S3, new contract, etc.
This bites Big Time!
Click to expand...
Click to collapse
Resurrecting this thread... totally frustrated with my S3 in Indianapolis. They are rolling out 4G which is great, but if I receive a call, it almost always goes silent after about 15-20 seconds then drops 5-10 seconds later. If I call the person back it seems fine and I usually don't drop the call. I feel like it's been worse since Jellybean. Another Sprint/S3 person in my office has the same issue, but a 3rd person says not that much trouble.
Already filed two complaints with Sprint--but I'm to the point of not answering calls and returning voicemails because of the issue. Sprint says "oh yea, we're working on the towers and it should be fixed". Can't wait for them to call me back and the call drops.
The S3 is great and much better than the S2--but if you can't answer your calls on your phone... I have a problem with that.
I hope anyone else with similar issues has called sprint to tell them to fix the problem. I may try Google Voice for calling to see if that helps, but the constant DTMF tones in the background of GV drive me batty.

T-Mobile user, Can't receive phone calls, caller says they go straight to voicemail

Hello everyone.
I'm new here and this is my newest phone purchase after weeks and weeks of research I decided to purchase this phone. However I'm having one big problem. I cannot receive phone calls using the phone. However I can send text messages which is strange and when I try to talk to someone it switches to 2G for no real reason too.
It's fully updated and completely stock in fact just purchased three days ago. I'm wondering what I could do so I can get this thing working again. I have 30 days to return this thing, and I rather not because its a rather good phone and I like it a lot but if I can't get it to receive phone calls then I have to return it.
please help anyone.

Dallas Texas said:
Hello everyone.
I'm new here and this is my newest phone purchase after weeks and weeks of research I decided to purchase this phone. However I'm having one big problem. I cannot receive phone calls using the phone. However I can send text messages which is strange and when I try to talk to someone it switches to 2G for no real reason too.
It's fully updated and completely stock in fact just purchased three days ago. I'm wondering what I could do so I can get this thing working again. I have 30 days to return this thing, and I rather not because its a rather good phone and I like it a lot but if I can't get it to receive phone calls then I have to return it.
please help anyone.
Click to expand...
Click to collapse
Try installing the t-mobile visual voicemail app, there maybe settings in there you can adjust, only if your U.S though.

boe323 said:
Try installing the t-mobile visual voicemail app, there maybe settings in there you can adjust, only if your U.S though.
Click to expand...
Click to collapse
I had the same problem check the apn settings my was the stock tmo setting with the phone and a . Was in the wrong spot

boe323 said:
Try installing the t-mobile visual voicemail app, there maybe settings in there you can adjust, only if your U.S though.
Click to expand...
Click to collapse
rob420p said:
I had the same problem check the apn settings my was the stock tmo setting with the phone and a . Was in the wrong spot
Click to expand...
Click to collapse
Alright I'll try and install the T-mobile visual voicemail app and see what is good
APN settings yes? I have tried that and tried inputting a manual one and even the ones on there which has three types of T-mobile settings

I'm not an expert on this but I have been looking for info on this for a while before I buy an A2 Lite to use on T-Mobile and I believe this post by a T-Mobile MVNO customer service rep may answer your question
The TLDR is that T-Mobile strictly uses band 12 for all VoLTE calls and if the phone doesn't support band 12/VoLTE T-Mobile forces it to use 2G for calls and texts. In some areas where the spectrum has been refarmed and there are a lot of 2G users your incoming call will time out before the tower finishes searching for you on VoLTE and ultimately tries to connect you to 2G, resulting in your phone not actually ringing.
This would also explain why there are no issues with texts, since they don't time out like an incoming call. Apparently there is no solution to this if you live in certain areas and use T-Mobile, and it will continue to get worse as spectrum is refarmed.
Sorry for the delay -- I'm technically off today. I saw you question and just had to pop in and answer, because I have a complete answer for you. Your issue is band compatibility, specifically the lack of Band 12. Let me explain:
For years and years, T-Mobile sent all their calls over the legacy 2G network on 1900MHz. Every call and text message went over this frequency, and all T-Mobile phones still support it for backwards compatibility.
Then, T-Mobile launched Voice over LTE, or VoLTE. But, they made the stipulation that VoLTE would only ever work on LTE Band 12. That means that any phone that didn't specifically have Band 12 LTE would still have to use the 2G 1900MHz frequency to send all calls and text messages. Any phone that did support Band 12 could use VoLTE and would send all their calls and texts through that VoLTE Band 12 connection.
That's not really a problem for most people, as T-Mobile's 2G network is still live in all their markets. These phones will connect to the LTE network for all data, but all their calls and texts go over that 2G connection.
Enter the problem: Spectrum crunch. Spectrum in the US is a limited resource. That's why the auctions always for it always go for millions of dollars for tiny portions. T-Mobile (and by extension, all its MVNOs, as we have no power over how they build their network) wants to make LTE the new standard, and push into 5G. In order to do that, they need to launch LTE in more places, and feed more devices than ever. They only have so much spectrum, so they reallocate what they already have to the new technology.
This is already happening with 3G. 2G is, again, just being kept around for backwards compatibility. They take the sectors that broadcast 3G (and 2G) and make them smaller and smaller, so the rest of the room can be used for LTE to service more devices faster. It makes business sense.
The process is called "re-farming" spectrum, and a quick Google search quickly becomes a rabbit hole as you find other people in your circumstance. They put the disused services on tiny little slivers of spectrum, some as small as 5MHz, which without getting too technical, is tiny.
If you happen to be unlucky enough live in an area where they're re-farming 2G spectrum to LTE, and your phone doesn't support VoLTE on Band 12, you're effectively fighting all the other T-Mobile (really any carrier, but for arguments' sake) customers whose devices also need to connect to that 2G network
Add enough people, and you get the problem you're having. A call comes into the network, and the towers go to work trying to find you. First, they try VoLTE, and don't find you there. Then they try the old 2G network, but there's like 200 other people in your area that are connected to that one tower, so it has to fight through them all to find your SIM card number and connect the call and-- right before it connects, the call times out of rings and your caller is sent to Voicemail.
You never get a missed call alert, your caller isn't alerted that your phone didn't ring, and because your phone didn't get a confirmation, you probably won't get a voicemail notification.
This doesn't affect the phone's ability to connect to the 3G network or 4G LTE Bands 2 and 4, which lots of phones support. But calls and texts don't travel over those networks. You'll still have an active, working data connection if this is what's happening to you, which is why it's hard to diagnose not just for Ting reps, but our customers and other MVNOs, as well as T-Mobile itself.
This problem isn't going to go away, and it's only going to get worse as re-farming 2G goes nationwide. It's not Ting-specific. Any T-Mobile device will have this problem if there are enough 2G-talk-and-text users in your area.
The phone in question, the Blu Vivo 5, supports Band 2 and Band 4 for LTE, but doesn't support Band 12, and thus doesn't support VoLTE. This is exactly what's happening to you.
This is exactly how it happened to my S/O. She had a Motorola Droid Mini on Ting GSM that worked great for years, on two distinct T-Mobile-powered networks. Then, T-Mobile re-farmed enough 2G in our area that she started missing calls, texts wouldn't arrive and she wouldn't get voicemails. The key identifier that this was her problem was that placing a call would take something like 10-15 seconds to connect. Typically, this should be instant.
There was nothing wrong with the phone at all -- it was working as designed. The second I got her into a Band 12 VoLTE phone, the problems disappeared completely. Nothing else changed.
The only solution is a new (or new-to-you) phone that supports Band 12 and VoLTE. No number of hard resets, network resets or new SIM cards will fix this problem. You'll have this problem on any network that uses T-Mobile as their backbone, as long as the phone you're using doesn't support Band 12 LTE and VoLTE.
Click to expand...
Click to collapse
I don't have a high enough post count to post a link but it was posted on r/Ting if you search that subreddit for the thread titled "Over 4 years and now this" you should find it. The info was written by u/literallyunlimited.

D412 said:
I'm not an expert on this but I have been looking for info on this for a while before I buy an A2 Lite to use on T-Mobile and I believe this post by a T-Mobile MVNO customer service rep may answer your question
The TLDR is that T-Mobile strictly uses band 12 for all VoLTE calls and if the phone doesn't support band 12/VoLTE T-Mobile forces it to use 2G for calls and texts. In some areas where the spectrum has been refarmed and there are a lot of 2G users your incoming call will time out before the tower finishes searching for you on VoLTE and ultimately tries to connect you to 2G, resulting in your phone not actually ringing.
This would also explain why there are no issues with texts, since they don't time out like an incoming call. Apparently there is no solution to this if you live in certain areas and use T-Mobile, and it will continue to get worse as spectrum is refarmed.
I don't have a high enough post count to post a link but it was posted on r/Ting if you search that subreddit for the thread titled "Over 4 years and now this" you should find it. The info was written by u/literallyunlimited.
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Thanks fam, I'll return it and get another phone I appreciate the information brother.