Iphone4S can't send text messages and make calls. What's the problem?

Iphone4S can't send text messages and answer calls. Generally speaking, operators will not provide services normally. You can check the specific reason according to the following steps:

1, check the internet access parameters, and enter Settings-General-Network in turn. Before the call, check "Cellular data switch on" or there is no capital "e" on the right side of China Mobile LOGO, and confirm that the column of cellular data APN is "cmnet".

2. Confirm whether there is a "description file". In actual use, when installing network-related applications such as bank clients or other third-party VPN tools, a description file may be automatically installed, and some description files will affect the internet access function, so it is recommended to delete them.

3. Confirm whether the operator patch is installed. IPhone jailbreak operation itself will not directly affect the Internet access function of mobile phones, but some users can't access the Internet after jailbreak, and then install operator patches. Even if the operator patch is installed, there is still a problem accessing the Internet. In this case, it is suggested to delete the relevant patch of the operator, restore the network settings and reset the access point. Method of restoring network settings: Settings-General-Restore-Restore network settings.