Phone calls dropping/cutting out

dinolardi

Hi everyone,

I've been using GrapheneOS on my Pixel 6 for about a year with no issues. However, since around September/October 2025, I've been experiencing persistent problems with regular phone calls — they drop, cut out, or just don't work properly.

What I've tested:

I put my SIM card in another phone running LineageOS → calls work perfectly. This confirms the issue is specific to GrapheneOS.
Reset mobile network settings → no improvement
Full reinstall of GrapheneOS → problem persists
Device: Pixel 6

Has anyone experienced similar issues? Any suggestions would be appreciated.

Thanks!

DeletedUser639

only twice did my 6 sort of drop calls, once to a contact in a car on the move, which was not entirely unexpected or the fault of my phone and the other was when the auto reboot took place turning my phone off mid call...

dinolardi I put my SIM card in another phone running LineageOS → calls work perfectly. This confirms the issue is specific to GrapheneOS.

No it does not, it tells me your P6 may well be the problem. Maybe your phone hardware is failing IE the modem, dropped your phone once too often etc...

dinolardi

DeletedUser639 Thanks for the answer, this is the answer I was afraid to read. My last test would be to switch to the stock OS and see if it changes anything (but I'm lazy).

DeletedUser639

dinolardi

the switch to stock OS need to be done.. unfortunatley.

cyberaiki

I've got the same problem with my pixel6. I have installed this about a month ago first time for me using the Graphene OS. While still learning how to use it and which app store to use, I've got pretty much everything working.
All of a sudden I've noticed that my calls are not working (call out "Call ended" calling in from a nother phone goes to Voicemail). I've followed another thread of pixel 6a, with same issues and tried to fix the problem using the same trick others said worked for them. It is working for a bit then again same problem. I've initially used a SIM I have from Romania Orange operator which waas fine. Then I got a SIM specifically to use with this phone as eSIM from Lyca Mobile UK where I live. Internet access works, SMS works but no calls. I've contacted the operator and started to have a basic troubleshoot with them and I've even requested a physical SIM to replace the eSIM, which in return I have the same problem. At some point calls were working then stopped again. I've then used a Giffgaff SIM, I'm normally uinig on OnePlus 13, worked then stopped working. Swapped the SIMs again and same issue.
The Lyca MObile SIM works perfectly fine on the OnePlus as well as the GIffgaff SIM, but allways having problems on Graphene OS.
I've done the Network reset, I've also looked for permition of the phone IMSService, allowed, Musing and sound app allowed over other apps, what ever I founs written here on this forum nothing seems to work.
I may have to go down the route of factory reset, but while I'm new using Graphene OS, not sure which app to use to backup everything and then to be able to restore after. (Also when I've got the phone from Amazon UK, as refurb phone I've tested the calling and other basic features on the original OS and all worked, but that was on time test as then I've flashed the pheonewith Graphene OS.
Any suggestions are much appreciated. I use this phone now to get used to it and to move permanently in the future to Graphene OS and degoogle myself :).

Regards,
Cyberaiki

de0u

cyberaiki I've got the same problem with my pixel6.

That seems unclear. That user reported one problem, calls not working well when connected, with one SIM card -- not no calls at all in either direction with two different SIM cards.

I recommend starting a new thread, being careful to list all of the events in chronological order, including how long the phone was working before GrapheneOS was installed, how long the Romanian SIM worked, etc. Based on tje age of the device, a hardware problem is possible, so a reset may be needed.