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Why can't 4s send text messages

1. The mobile phone is in arrears and needs to be recharged!

2. If it is mobile, call 10086, Unicom100, Telecom 10000, and then call customer service and ask her to tell you how to change the number and setting method of the SMS center! Just set it up!

3. Change the card after sale, here refers to the small card! Move to the mobile business hall, Unicom and Telecom to their respective business halls! These have special cards for iPhone! And it's free! It is easy to damage the chip by cutting the card yourself, which makes it impossible to send short messages! If you don't have a small card there, cut another one! That should be enough.

4. Change the calling card suitable for mobile phone frequency band. For example, wcdma can only use Unicom 3G or Mobile Unicom 2G, and cdma2000 can only use telecom cards.

5. There are only the above four possibilities.