Solution to the problem of iphone 12 full grid signal but disconnected.

This solution is suitable for most 12 series, at least that's how I have been solving it.

I believe that there are some iPhones 1 2, and occasionally the mobile phone signal is full, but the Internet cannot be accessed at all, as shown in figure1.

At this time, whether you are in flight mode or constantly switching phones, you can't solve it. You can only restart your phone. This is no problem, but it's sour when you need a bright green code.

Now there is a faster solution, that is, making a phone call with a mobile phone, such as the number 10000, which takes about 10 to 20 seconds, and the network search shown in Figure 2 can be resumed immediately. Although it's troublesome, it's at least faster than restarting your phone after the last operation.

This problem actually didn't appear until it was updated to 14.3. I thought it was the operator's problem, but now it seems to be a system problem, because I tried to use other operators and it still happens occasionally, especially when I disconnect wifi. I can only hope that the next version will be fixed.