1. Restart your phone. Check your SIM/eSIM, active account status, device compatibility and carrier-unlocked status.
2. Choose the Nexoria line for texts if you have multiple SIMs. Try sending a basic text to a known contact; check that the number is correct and not blocked.
3. Turn on mobile data for picture/group messages where required. Check your messaging app permissions and available storage.
4. If you moved between iPhone and Android, check the previous iMessage or RCS registration using the device maker’s official instructions. Some messages may still be routed to the old device.
5. Check service notices. If the problem continues, tell Customer Service whether SMS, picture/group messages or app messages are affected and when it started. Do not send verification codes or private message contents.