not able to receive verification codes on my android after switching

Question

I have seen on here a few people with the same issue, I have also seen the troubleshooting i have done them all bar the imessage for obvious reasons. However I have turned on and off the RCS, I have rest my device, I have turned on and off my device, I have the phone number they are sending the code to, I have put my phone on and off airplane mode, I have checked signal.

Its still not working, I can receive sms from friends and family but not the verification codes for banking or login in to web pages. This is really frustrating especially as its clearly a known issue based on the number of people that have reported it on here.

In addition numbers that try to call me that I don't have as a saved contact won't connect, my phone doesn't even ring.

Owethu M · Answer

Hi ​@Bluefinmum,Thanks for the detailed explanationI can see why this is frustrating, especially when it affects both OTPs and incoming calls from unknown numbers.Based on what you’ve described, this is no longer an APN or basic handset issue. Your SMS from contacts working confirms the SIM is active and generally provisioned correctly. The problem is specifically affecting A2P (application-to-person) messages like OTPs and some inbound call routing, which typically points to either:a network-level filtering/provisioning issue on the line, oran incorrect/unclean number registration on messaging services (including RCS / Google messaging profile sync issues)✔️ First important step (iD Mobile requirement)You will need to follow the official guidance here and ensure your number is correctly registered and recognised on the network:👉 https://community.idmobile.co.uk/network-troubleshooting-177/i-can-t-receive-one-time-passcodes-otps-to-my-sim-what-should-i-do-68095Make sure you specifically:confirm your correct mobile number is showing in device settingsensure it matches your iD account number exactly (no old/ported number remnants)re-save it if needed, then restart the deviceThis step matters because OTP delivery systems rely heavily on correct MSISDN registration.✔️ Next: RCS / messaging reset (important)Even though OTPs are SMS-based, RCS registration issues can sometimes interfere with messaging routing on Android devices.Please complete the following:1. Turn OFF RCS completelyOpen Google MessagesTap profile icon → Messages settingsTap RCS chatsTurn OFF2. Clear messaging sync stateGo to Settings → Apps → MessagesStorage → Clear cache (not data if you want to be cautious)3. Reboot the phone4. Turn RCS back ON (after reboot)Go back into Messages settings → RCS chatsTurn ON againWait a few minutes for registration✔️ Additional checks (important for OTP + calls issue)Given your symptom of unknown callers not connecting at all, also check:Spam / call filteringPhone app → Settings → Caller ID & spam → turn OFF temporarilyBlocked numbers listEnsure no unknown ranges or private number blocking is enabledNetwork modeSet to 4G/3G/2G auto (not LTE only or VoLTE-only mode)Owethu