2FA Code Received on Every Reboot

aoude

I'm having an issue on GrapheneOS on my Pixel 10 Pro where I get an old 2FA SMS after each reboot. I didn't seem to have this issue back at the beginning of December. Since then I switched back to stock Android, and only several days ago I switched back. I noticed since switching back that I receive a single 2FA SMS code upon rebooting:

Steps:

Receive a 2FA code (ex. Whatsapp, rideshare, banking)
Reboot device
2FA code is received again (details show same timestamp for sent date/time but a new timestamp for received date/time according to the time at reboot)
Repeated reboots continuously produce this same effect, receiving the same exact message contents / 2FA code every time

Failed solutions:

clear storage and cache for GOS messaging app
turn on airplane mode, turn off wifi, turn off Bluetooth (indicates to me that it is not being resent by the carrier but something internal, FWIW chatGPT suggests an issue acknowledging a high priority 2FA SMS coming from the phone's modem, no clue how much credence to give this interpretation, but it did lead me to a temporary solution I have provided below)
remove and add eSIM
turn off volte, lte, 5G (use 3G specifically)
contacted service provider (T-Mobile) and tested two solutions: (1) reprovision eSIM (2) remove eSIM and get a QR code for a new eSIM with new ICCID

Temporary solution:

settings -> system -> reset options -> reset mobile network settings
this must be performed again after receiving any 2FA SMS code prior to rebooting

Please let me know anything I can try for a permanent solution to this. Thanks!

dregrinfuces

I had the same problem a couple of weeks ago. Booting into Safe mode and out again cleared it for me.

aoude

dregrinfuces Unfortunately that didn't fix it for me. It also resets all your default apps which is a bit annoying 😅. One thing I noticed also is that when I reboot, if I open the Google messages app right away and go to the number I am getting the code from, it says at the bottom of the conversation "Please insert a SIM to continue". I assume as soon as the eSIM is recognized that causes that SIM message to go away, and the duplicate 2FA text comes in at that point

w1ll1am

I'm seeing the same thing. Using Google messages and RCS using Verizon in the US.

aoude

Honestly I'm just back to stock. I manually removed myself from RCS groups and turned RCS off before switching, but iPhone users' phones still tried to reach me via RCS. Like the first time I went to grapheneOS I missed really important family group messages as a result. I think the GOS project is great but the lack of basic functionality like RCS is really proving to be a deal breaker. I can't use it in the current state. I didn't find a solution for this either although it wasn't a deal breaker by any means

NetRunner88

aoude
RCS isnt graphene dependant
I had the situation myself with double or triple messages received. It was from the ISP not the phone..

aoude

RCS issues are from the carrier, but the issues are only present on GrapheneOS, not stock OS. If I had known about this I would never have used RCS, but since it has been enabled there isn't really a good solution to avoid missing potentially critical messages from friends and family using iPhones.

Regarding double or triple messages, you didn't mention 2FA messages. This issue specifically relates to 2FA messages from banks, rideshare, etc. I'm nearly certain it is not an ISP issue as it has nothing to do with internet connection. The duplicate messages are only received on reboot. And they are received even in airplane mode without connection to an ISP or mobile service provider. This suggests the messages are being stored somewhere on the device and delivered upon each reboot unless my temporary fix is used.

beakman

I'm getting these messages on reboot on the GOS Messages app (no RCS).

This issue has me wanting to pull my hair out and go back to stock Android.

aoude

beakman

I feel you, fortunately there is a temporary solution I found before switching back to stock because of RCS issues:

settings -> system -> reset options -> reset mobile network settings
this must be performed again after receiving any 2FA SMS code prior to rebooting

edit: fwiw, I looked into a tasker-like automation to perform the reset with a simple button press, but AFAIK the setting doesn't have an exposed API that a tool like tasker can use