the problems related to network search and access to the network are diagnostically difficult defects. This should be investigated methodically, successively excluding possibilities. There are many tools (many of which you probably own) and methods for doing this. Much depends on the life cycle of the phone. You do not write about it - did the phone fall, was flooded, etc.
if you have a computer and can communicate with an iPhone, you can use it via the communication terminal and ask the processor about the status of the devices (super detailed method). If you are "analog" turn on the phone and check the band number (version), IMEI and CCID items in the settings. The reader can be checked by entering the code * 3001 * 12345 # * on the keypad and selecting Device information - >> SIM files to operate the SIM reader itself. By the way, check the code * # 06 #, the IMEI number should be displayed (it's the same IMEI, but obtained by a different device) - this will tell you a lot.
Finally, a little about the hardware layer - if the phone has previously been dropped or flooded, find a good repair service. Such a defect must be well diagnosed. Most often it is enough to rebuild the soldered connection of the motherboard - it cracks due to an impact or the electronics are wiped out after flooding. It all depends on the time of the fault and the skill of the technician. It can also cost a bit - take that into account.
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