Chosen Solution
I have an iPhone 7 at my shop, When I first inserted a sim card it read it, and I was able to make a phone call. I then restarted the phone and updated it. After restarting it says “Carrier update failed”. It is stuck on searching in the top left corner, and under the Cellular setting it only says “error” “An update is required to
Check to see if this is a hardware fault or a software fault. Input *#06# into the keypad and see if it brings up your IMEI number. If it doesn’t you have a hardware problem in the BBPMIC or BBCPU.
