Develop Bugs

Unlocked S9 cannot register on Verizon MVNO?

I've got my unlocked S9 from Samsung. I have a Redpocket CDMA sim card, which works fine in a Samsung S7E and a Google Pixel. However, when putting this sim card in S9, the S9 could not get on its network. It shows Emergency calls only and "Not registered on network" when making a call.
Sometimes it shows "refreshing sim card data" and no network. When turning to network modes, it says "LTE/3G/2G" etc but redpocket cs seems to believe the right one should be "LTE/CDMA" instead, which is not in the list.
I tried various usual ways such as factory reset etc, which did not change anything.
I tried a project Fi and a verizon sim card in the S9 and they were recognized with no problem. Thus I think the S9 is not defective.
I did some searches and people mentioned S8 had the same issue too: https://forum.xda-developers.com/galaxy-s8/help/unlocked-s8-failed-to-register-red-t3736850
I am wondering whether anyone has this problem or a solution.
Will flashing to verizon firmware help?
Thanks.

I'm having the same issue with PagePlus! I just put the SIM from my VZW S6 into my unlocked S9 and when that didn't work I chatted with support to do an ESN change (I thought perhaps PP needed to do something on their end). I was told if there was no "LTE/CDMA" option that the phone wouldn't work on PP.
I tried using an app to switch between different network modes (including the LTE/CDMA/UMTS auto which my S6 uses) to no avail.
I'm tempted to try flashing the VZW firmware, but the post here makes me wonder if it will accomplish anything.

I tried that APP to force network mode too but it did not seem to work.
As an update, Redpocket customer service is really great that they moved my number from Verizon network to their GSM/ATT network, and everything works fine now. I do not want to try flashing verizon firmware for the same reason...
Too bad Samsung could not get such a simple thing right.
janame said:
I'm having the same issue with PagePlus! I just put the SIM from my VZW S6 into my unlocked S9 and when that didn't work I chatted with support to do an ESN change (I thought perhaps PP needed to do something on their end). I was told if there was no "LTE/CDMA" option that the phone wouldn't work on PP.
I tried using an app to switch between different network modes (including the LTE/CDMA/UMTS auto which my S6 uses) to no avail.
I'm tempted to try flashing the VZW firmware, but the post here makes me wonder if it will accomplish anything.
Click to expand...
Click to collapse

Can we sue them?
I faced the same issue too. Apparently, Samsung does a setting update that prevents the sim from registering for Verizon's MVNOs. I called them and they said they NEVER heard of this issue. Apparently, you all did too. I am tempted to sue Samsung for this since this could be an antitrust issue. They are preventing competition by working with Verizon and feigning ignorance.Can any of you comment on this?

I was going to go with one of Verizon's mvnos. And their SIM card would not work and I did not realize it until I spend the $40. I had to put an actual Verizon sim in my unlocked phone to use the Verizon network. So either Verizon is blocking the S9 on mvns or the mvnos don't have the updated information for the S9. Total wireless told.me it Had to be a Verizon branded phone for it to work. So I think if someone flashed the Verizon firmware on the unlocked version it probably would work.

i dont see anywhere on the post where you contacted the MVNO provider, to register the ESN or IMEI of the device.
Also does this MVNO even allow BYOD?
i remember I had a line from Cricket or Metro that had a sim card, it worked on my Nexus 5x, however inserting it to another nexus 5x, it didnt work, I had to call them to register my IMEI

Hey guys this is an old thread, but maybe this will help someone. My old Red Pocket SIM would not work on the S9, but my renewal came with a new SIM, ending in 8222-15XX (old was 8180-50XX) For ****s and giggles I put it in and it showed LTE/CDMA and verizon. Had RP CS switch my active SIM and now it works with no workaround!
TL;DR Try a new RP SIM if you are using one a year old or older.

I also have similar issue.
Where I used to get lte over voice, but no longer getting after a recent update from samsung. Using Redpocket cdma sim
Now I have lte and voice, but dont get lte over voice even though redpocket said they have enabled Volte on my line

We just added an Unlocked Galaxy S9 (replaced S5) purchased from Amazon (Black Friday sale), ordered new Sim from Pageplus (MVNO using Verizon ), called them to transfer the phone number, popped it in and the S9 configured itself for Pageplus, and everything works perfectly...

ToyTank said:
Hey guys this is an old thread, but maybe this will help someone. My old Red Pocket SIM would not work on the S9, but my renewal came with a new SIM, ending in 8222-15XX (old was 8180-50XX) For ****s and giggles I put it in and it showed LTE/CDMA and verizon. Had RP CS switch my active SIM and now it works with no workaround!
TL;DR Try a new RP SIM if you are using one a year old or older.
Click to expand...
Click to collapse
That's great news. I switched to GSMA due to CDMA issue. I will switch back to CDMA after my current plan expires.
I heard that RCS (messaging via wifi connection similar to imessage - samsung messages app supports it in pie I believe, not sure about oreo) is active in verizon now including mvnos. Have you tried it?

sam298 said:
That's great news. I switched to GSMA due to CDMA issue. I will switch back to CDMA after my current plan expires.
I heard that RCS (messaging via wifi connection similar to imessage - samsung messages app supports it in pie I believe, not sure about oreo) is active in verizon now including mvnos. Have you tried it?
Click to expand...
Click to collapse
I tried for my unlocked note 8. For the new sim coming from red pocket, it works great at the first time. But later when I switch the sim to a GSM sim for international travel and then switch the sim back to the red pocket sim, the same problem appeared. I have to use verizon sim to get LTE/CDMA back in the emergency mode.

queenriver said:
I tried for my unlocked note 8. For the new sim coming from red pocket, it works great at the first time. But later when I switch the sim to a GSM sim for international travel and then switch the sim back to the red pocket sim, the same problem appeared. I have to use verizon sim to get LTE/CDMA back in the emergency mode.
Click to expand...
Click to collapse
Traded in my S9 with an S10+ and the redpocket CDMA sim works now!

ToyTank said:
.My old Red Pocket SIM would not work on the S9, but my renewal came with a new SIM, ending in 8222-15XX (old was 8180-50XX) For ****s and giggles I put it in and it showed LTE/CDMA and verizon. Had RP CS switch my active SIM and now it works with no workaround!
Click to expand...
Click to collapse
I think you've found the answer for those who are unable to get their existing RP SIM to work on the S6-7-8-9's running OREO or PIE. I just took a later serial numbered CDMAV SIM (89140000018821472XX), inserted it into another S8+ that I have, booted it and saw the Verizon Wireless scroll across the top. I'll chat with RP today and see if they will switch the ICCID numbers between old and new.
After countless hours looking into this problem, I tip my hat to you for the solution provided.

Try as I may, in the end it didn't work for me.

It worked for me when I flashed the latest un-branded U1 firmware G960U1 UEU6CSI1 via the patched Odin, from:
https://updato.com/firmware-archive-select-model/?record=E68EDDB6DBFB11E99E59FA163EE8F90B
I've also done a full factory reset from recovery after the flash.
I guess they must have fixed it with the latest firmware updates... ymmv

Since the August update, both of my Verizon branded S8+'s work directly upon inserting a RP sim card.

POSSIBLE SOLUTION!! (YMMV)
I had a similar problem when I upgraded to Android 10. I no longer had CDMA as a choice for Network mode. Here is the solution that worked for me:
Step #1:
Go to the phone dialer and dial *#*#4636#*#*
This will bring up a new screen
Select "Phone Information"
You will be greeted with a scary-looking screen with lots of stuff
Scroll down and look for "Set Preferred Network Type"
Select "LTE/CDMA auto (PRL)" from the drop-down
This will give you phone service... but not data.
STEP #2
To get data services, you will need to create an APN.
Go to settings/connections/mobile networks/Access Point Names
Click on add and enter the following:
APN Name: Verizon
APN: VZWINTERNET
MCC: 311
MNC: 480
Authentication Type: None
APN Protocol: IPv4/IPv6
APN Roaming Protocol: IPv4/IPv6
I found that this APN worked for me... (YMMV)
Hope this is helpful...

are you folks still having trouble with this? it doesnt seem like a difficult obstacle to overcome

Thank you sooo much! Creating the APN did the trick.

VoLTE not funcional with S9 Exynos

Hi there, greetings from Brazil. I just purchased a Samsung S9 SM-960F (XEF) from France, running Exynos. I am being able to use it here (Brazil) with 4G, both sim cards, however VoLTE calls are not active. I have it selected on networks settings and my sim card activates it on my wife's S10e. It seems that the issue is somehow related to the device. Is there any setting or procedure that needs to be done in order to activate it? I have already hard reseted the device and it is still not working.

Marciocons77 said:
Hi there, greetings from Brazil. I just purchased a Samsung S9 SM-960F (XEF) from France, running Exynos. I am being able to use it here (Brazil) with 4G, both sim cards, however VoLTE calls are not active. I have it selected on networks settings and my sim card activates it on my wife's S10e. It seems that the issue is somehow related to the device. Is there any setting or procedure that needs to be done in order to activate it? I have already hard reseted the device and it is still not working.
Click to expand...
Click to collapse
voLTE is something that is carrier dependent and can sometimes need provisioning in the telephony switch. Could be as simple as that particular line not having it enabled on an account level. It could very easily be a firmware thing too. My carrier offers voLTE but i lost that option in my settings menu when i flashed the U1 firmware. I bet it would come back if i flashed an at&t firmware set tho even tho im using an at&t mvno

It is carrier dependent. I have a dual SIM Exynos S9 here in the US. I have a Mint SIM (T-Mobile MVNO) in one slot and VoLTE & Wi-Fi calling work just fine. The other SIM is a Cricket SIM (AT&T MVNO) and, of course, there is no VoLTE or Wi-Fi calling on that line. Cricket only supports those features in phones they sell and, of course, iPhones.

Yeap, I got the point that VoLTE is carrier dependent. The issue is that my Brazilian Carrier (VIVO) does support VoLTE in my region and I was able to confirm it by inserting my simcard in my wife´s smartphone (Samsung S10e). I have been reading some articles and threads about CSC and other stuff, like firmware flashing. As I told, my device is a S9 SM-G960, with XEF (France) firmware version installed on it.

Marciocons77 said:
Yeap, I got the point that VoLTE is carrier dependent. The issue is that my Brazilian Carrier (VIVO) does support VoLTE in my region and I was able to confirm it by inserting my simcard in my wife´s smartphone (Samsung S10e). I have been reading some articles and threads about CSC and other stuff, like firmware flashing. As I told, my device is a S9 SM-G960, with XEF (France) firmware version installed on it.
Click to expand...
Click to collapse
if the S10e is allowing voLTE, then it has the firmware built in for voLTE which might be particular to the the S10's, but thats something for the S10 forums. Regarding the S9, it needs the carriers firmware in order to utilize the voLTE feature

Trying to Configure Note10+ 5G (N976V) with Visible but can not add APNs.

Trying to Configure Note10+ 5G (N976V) with Visible but can not add APNs. The option is Greyed out. I was able to do it with my Verizon S10 that is also not officially supported. Crazy thing is that for about 5 min i was able to use the Visible SIM in my Note and Call and Send Txt until I rebooted the Phone. The Phone is paid off and Im using it on Mint Mobile now but it doesnt Show the T-Mo Boot Logo when I switched SIMs like my S10 Did. Has anyone been able to get this to work. I was told by Samsung that I may need to Reflash the Phone.

i have the regular unlocked note10+ working on visible.

N976V on Visible.
I am having the same issue, the APN settings are disabled. If you get this resolved before I can figure out a work around please let me know. Thank you.
Rocking Visible Wireless with the following devices,
iPad Mini 4th gen
Samsung Note 9 SM-N960u
Motorola Z2 Force XT1789-01

hammerhead13 said:
Trying to Configure Note10+ 5G (N976V) with Visible but can not add APNs. The option is Greyed out. I was able to do it with my Verizon S10 that is also not officially supported. Crazy thing is that for about 5 min i was able to use the Visible SIM in my Note and Call and Send Txt until I rebooted the Phone. The Phone is paid off and Im using it on Mint Mobile now but it doesnt Show the T-Mo Boot Logo when I switched SIMs like my S10 Did. Has anyone been able to get this to work. I was told by Samsung that I may need to Reflash the Phone.
Click to expand...
Click to collapse
Did you work it out? if yes, can you share how?

As soon as someone has resolved this issue, please update this forum page!

I just upgraded my note 8(on Visible) to the note 10 plus 5g. After i put in the Visible sim card into my note 10 phone, the phone was not working with the Visible sim card. I was connected onto the wifi network at work and I went into the settings to update the APN information, but it was greyed out and could not enter that information into the phone. After a few hours of googling to see if I could fixed the greyed out APN area so that I could actually enter in the programming, I said let me check the phone outside with wifi turned off. I went outside and tried to place a call and the call connected. I was then able to get wifi calling turned on since the phone was not allowing me to do so before. I went back into work and tried to place a call on the wifi network and it worked. I also tried sending text messages and mms messages and they all work. I checked the settings under the APN area and the phone automatically populated the Visible Internet setting but it was also greyed out, but it was working and I was so happy. I am so happy now with my new galaxy note 10 5g phone that is up and fully working with the Visible sim card. So I believe that having the phone connect onto the cell tower signal and not the wifi allowed the phone to pull in the APN information that it needed. I also reset via the setting the network connections while I was outside a few times. Hopes that this helps...

Change CSC with SamFw Tool (don't brick your device!!!)
Don't update beyond U4
Unlock bootloader and root.
Modify everything.
Accuse Samsung of being stupid for ever creating such a product with such limitations.

AT&T VoLTE is possible. Just got it turned on

I was finally able to get AT&T to get my VoLTE turned on. It took two chat sessions but finally I got them to turn it on.
VoWiFi... not so much. They wanted me to go in to a store, because the phone isn't an AT&T sold phone. The chat representative said they would do something to the phone to turn it on even if the VoWiFi switch is already turned on.
Side Note for VoLTE:
My suggestion is tell them you used the dial code "*#*#4636#*#*" and tell them you can see that the VoLTE isn't enabled. And if your phone isn't registering with the IMS info, let them know too.
Good Luck
Anyway here are the screen shots:

You sir are a saint, thank you so much for this helpful information.

That dial code doesn't do anything when I type it in for some reason.

I was able to get VoLTE on both mine and my wife's OP8 Pro by just having the phone agent register the IMEI and rebooting.
I have submitted a ticket with their advanced team for enabling 5G provisioning since we have the 5G bands (or at least one of them) for AT&T. I will follow up if I am successful.

yeah I came from the Note 10 5g on ATT and i didn`t have to do anything, I just put in my sim and turn on VOLTE and it just worked. but Vowifi is another story. lol, I`m going back to Tmobile in couple of months, at least they allow vowifi and 5g to work without the BS from ATT

Will be trying myself and will post if make any progress

I ended up with a MVNO provider Ultra Mobile as a 2nd line on SIM2 (need a 2nd line for work anyway). That gives me 5G+VoLTE+VoWiFi unlike AT&T.
really wish AT&T business practices change. It sucks that AT&T does their customer like that.

I have enabled Volte via PDC method, disabled overseas commercial and activated CU-LTE.
Everything works great.
Japan Rakuten/AU Mobile

Question Realme Gt Master Edition VoWifi dont work?

Realme Gt Master Edition VoWifi dont work?

gfpeti2 said:
Realme Gt Master Edition VoWifi dont work? PLease help, Thanks !
Click to expand...
Click to collapse
it depend on your sim card carrier

I have been looking for that information, thinking about getting this phone to use T-Mobile USA GSM voLTE? is this phone compatible?

@ryantek No, it's not. I have been using Gt Master in Mint Mobile (which is T-Mobile MVNO) for 6 month and no VoLTE, no VoWifi. I could use mobile data, but even this was not very good, often gets stuck to 3g network, though GT Master supports most of the LTE bands used by T-Mobile (except for B71 600Mhz).
I had two long chats with Mint Mobile customer service, no resolution.
I believe it's gonna be even harder to activate it after July 1st, when T-Mobile will shutdown it's 3G network. Mint Mobile didn't make me any problems to buy and activate service, but now constantly bugs me to replace phone for compatible with their network.
I've also tried it with US Mobile (T-Mobile network), Boost Mobile (ATT) and couple others. The same effect.
Save yourself some trouble and buy phone that's on compatibility list: Oneplus, iPhone, Samsung or Motorola.
I bought Galaxy S22 and now use it as my main device in Google FI. GT Master still have active Mint Mobile simcard until 3rd of June, but after that it will be over.

Hi,
Thank you for sharing all of this information. It is sad to see the carriers in the USA do not support this phone. Sadly I will stay away until anyone can confirm a phone of this brand that works with VoLTE (Tmobile).
Once again Thank you.

ryantek said:
Hi,
Thank you for sharing all of this information. It is sad to see the carriers in the USA do not support this phone. Sadly I will stay away until anyone can confirm a phone of this brand that works with VoLTE (Tmobile).
Once again Thank you.
Click to expand...
Click to collapse
Set up VoLTE and VoWiFi via QPST and the ( advaced pdc tool PDC ) Root is required. This option works in stock. You need to try several "choose" profiles, one will definitely go
In custom rom, if it doesn't work, just back up the EFS partition (after editing in stock rom) and restore it later in custom rom

I see. Wondering is there is a signed ROM with VolLTE enable out of the box.

Today I tried Google Fi simcard with my Realme GT Master (normal not modified ROM) and it worked!! VoLTE is working and so is VoWiFI (I think). I'm not 100% sure about VoWifi. I have icon of VoWifi during call but I can't make call just on WiFi while on Airplane Mode, I have to turn off Airplane Mode or it doesn't allow me to make a call.
Google Fi was activated with Galaxy S22 few months ago.
I'm not gonna test it for long, because I use Galaxy S22 as my main device now and in few days I'll move to US Mobile/Verizon, but Google Fi is usable. I still can't recommend buying GT Master for US: too much hassle, too many unknowns.

nndn said:
Today I tried Google Fi simcard with my Realme GT Master (normal not modified ROM) and it worked!! VoLTE is working and so is VoWiFI (I think). I'm not 100% sure about VoWifi. I have icon of VoWifi during call but I can't make call just on WiFi while on Airplane Mode, I have to turn off Airplane Mode or it doesn't allow me to make a call.
Click to expand...
Click to collapse
so basically you don't know which network you were on while VoLTE started to work? Google FI uses all three networks and switches them dynamically

As far as I know Google Fi uses two networks: Tmobile and Us Cellular. As I'm in western Massachusetts and US Cellular doesn't have coverage here, I'm pretty sure I got connected to T-Mobile. But I can't confirm it with 100% certainty.