Please follow the below steps:
1. Confirm whether the SMS number is correct.
2. The network congestion of your operator may cause delays in receiving SMS.
3. The recipient's mobile phone memory may be full.
4. If the receiver has not been in the service area for a long time, the SMS may have timed out and been deleted by the SMS centre.
5. There are sensitive words, which are directly deleted by the operator in the SMS Centre.
If the issue persists, contact the Nothing Support Team for further assistance.