Tg telegrams always fail to receive verification codes.

1. The international short message service has not been opened. Consult telecom operators whether to close the international short message service by default;

2. SMS service outsourcing. Telegraph short message service belongs to outsourcing business, which is handled by a third party company, so the source of short message is different every time;

3. Delay in receiving verification code. Receiving the verification code may be delayed for some time.