Hi everyone,
I recently moved to the USA (currently in Omaha, NE) from Bangladesh and brought my CMF by Nothing 1 phone with me. The device was originally an Indian region model, and it worked perfectly fine with all services back in Bangladesh.
After doing some research, I found that T-Mobile should offer the best compatibility with this device in the US. However, I’m running into a frustrating issue and could really use some guidance.
Here’s what’s happening:
When I insert my T-Mobile SIM and enable Smart 5G + 5G Standalone (SA):
Internet works perfectly (data is fast and stable)
But calls don’t work at all — I can’t make or receive calls, and others can’t reach me.
If I turn off 5G Standalone:
Voice calls start working But mobile data stops working entirely .
4G/LTE doesn’t seem to connect for data either
Additional Info:
VoLTE seems to be supported but doesn’t activate reliably.
The phone doesn’t fall back to LTE/3G for voice when on SA 5G.
I’ve tried restarting the phone, resetting network settings, and checking APNs — no success so far.
The phone may not fully support the exact T-Mobile 5G SA bands or VoNR (Voice over New Radio).
My Questions:
1. Is there any workaround to make both calls and data work simultaneously?
2. Has anyone had success using the CMF Phone 1 (Indian variant) on T-Mobile or any other US carrier?
3. Would switching to a different carrier (like AT&T or Mint Mobile) help with compatibility?
4. Is it possible to manually configure the phone to force VoLTE or disable SA-only behavior?
Any help or suggestions would be really appreciated. I’d love to keep using this phone if there’s a way to make it fully functional here.
Thanks in advance!
