The steps of sending SMS to China Telecom's overseas mobile phone number are as follows:

1. Make sure your mobile phone number is enabled for international roaming.

2. To edit the message content, you must enter "+86" at the beginning of the other party's number.

3. Send the mobile phone number to Chinese mainland, and directly enter the other party's mobile phone number.

4. To send to a mobile phone number outside Chinese mainland, you need to enter "00+ country code+mobile phone number" before the number.

For example, to send short messages to mobile phone users in China and Hongkong, you need to enter "00852 mobile phone number".