The network congestion of the mobile phone may incur this problem, please try again in 10 minutes.
However, you can try to solve the problem following the steps below:
1. Make sure the phone signal is working well. If not, please move to a place where you can receive a good signal on your phone.
2. Turn off the function of the blacklist or other ways to block SMS.
3. Switch your phone to Airplane Mode, reboot your phone and then switch off Airplane Mode.
Please submit a ticket to us if your problems still can’t be solved through the above methods.
Note: When you send a ticket, please attach your phone model, system (iOS, Android), your country and city, and detailed information. We will deal with your concern as soon as we receive your ticket.