IPhone5 suddenly shows no service, so you can't make phone calls or send text messages. The operator shows that it is not available, and the power on/off, card re-insertion and flight mode have all be

IPhone5 suddenly shows no service, so you can't make phone calls or send text messages. The operator shows that it is not available, and the power on/off, card re-insertion and flight mode have all been tried. the iphone 5 suddenly shows no service, so you can't make phone calls or send short messages, and the operator's display is unavailable. You can check the specific reasons according to the following steps:

1. Check the internet access parameters, enter Settings-General-Network in turn, and check whether the "cellular data switch" is turned on.

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

3, confirm whether the operator patch is installed. The operation of jailbreaking the iPhone itself will not directly affect the Internet access function of the phone, but some users can't access the Internet after jailbreaking, and then install the operator patch. Even if the operator patch is installed, there are still problems accessing the Internet. For this kind of situation, it is suggested to delete the relevant patch of the operator, restore the network settings and reset the access point. Method for restoring network settings: Settings-General-Restore-Restore network settings.