IPhone keeps searching for network even w/o sim card

Good morning,
my iPhone doesn't connect to my network anymore. I flew from Europe to the US a few days ago and it worked just fine in the beginning, but when I went on the subway and lost reception it didn't come back. A quick restart of the phone helped the first time. Now it happened again yesterday when I went on the subway and the reception hasn't come back since....
The Phone never asks me for the PIN if I restart the phone, even though it should and all it says is "Searching....", even if I remove the SIM it says "Searching..." instead of "No SIM".
I can still use Wifi though!
Here is what I've already tried:
Restarted the phone several times (both regular and the two-button way)
Reset all settings
Reset network settings (twice)
Switched airplane mode on/off several times (it was on for several hours over night)
I have tried a different sim card of a different carrier, so it's definitely the Phone.
I really want to avoid to delete everything. Does anyone have any idea how to solve that?
I appreciate any advice. Thank you in advance!

Next step is to back up and restore your software.
iOS: Back up and restore your iOS device with iCloud or iTunes

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