Why can't the contract machine of Unicom iphone4s send text messages? I always fail to send, but I can receive messages from others. Send 100 10, MMS. ...

Hello, the number setting/inquiry/cancellation of SMS center of iPhone is inconsistent with that of ordinary mobile phone.

Please follow the following steps:

How to set/query/cancel the SMS center number of iPhone;

Set SMS center number: use iphone to dial *5005*7672*+86 local SMS center number # and press Call.

Check the number of SMS center: dial *#5005*7672# with iphone, and press Call.

Delete the center number: use iphone to dial ##5005*7672*+86 local SMS center number # and press Call.

If you still can't send or receive SMS, please follow the following steps to analyze the reason:

Step 1: Check whether there is a short message function.

Step 2: Is the number of SMS center set correctly?

Step 3: Are prepaid users within the normal validity period or have sufficient balance?

Step 4: Is the inbox full?

Step 5: Have you changed your mobile phone?