Upgrading 4s to ios9.0.1, there is no service. You can make calls but cannot send text messages online.

The synchronized push summarizes the situation of being unable to send text messages online after the ios system is upgraded. It may be due to the following reasons:

The main problems are as follows:

1. The operator cannot be displayed, there is no service, you can make calls but cannot access the Internet, you cannot send text messages, and you cannot call the person whose name requires +86

2. When you turn it on, it prompts that your IPhone has not been activated, please contact your operator< /p>

3. US version, Japanese version Verzion, Sprint, Au, ATT, T-moblie, etc.; China Mobile 4G card, China Unicom 3G card, cannot access the Internet, cannot send text messages, requires +86, cannot call the name of the person, Cannot use Jiugongge input method, jailbreak, rooting, white apple, power consumption problem

4. The built-in card sticker cannot be activated after upgrading to the latest version of iOS, and prompts the operator to update. You can make and receive calls but cannot use cellular Internet (2G) , 3G, 4G), etc., problems such as being unable to send short messages

5. IPhone uses a mobile 4G card. If the phone is locked, use the card sticker. If the phone is not locked (built-in card sticker), remove the built-in card sticker. Can make calls but cannot send text messages online

6. Frequent no service or no service in a certain area, searching, unstable signal, can be solved by jailbreaking or not jailbreaking

7. When making a call, it prompts that you have not activated international roaming and other issues, and you cannot access the Internet and cannot send text messages;

8. If you have a locked phone, use an unlock card to crack the system. When upgrading or jailbreaking, white apples, ITunes data cables, and black screens appear. Can't turn on the computer, heat problem

The original poster will check if it is one of the above problems. If so, you can only re-flash the phone. It is recommended to download the data tutorial from the synchronization assistant on the PC side. Then There are detailed tutorials on the side, which is great. I recommend you try it...