What's wrong with my iphone 7?

On my way back from college on Friday i was on the road and i noticed my phone was dying so i put it on airplane mode and charged it and then when it was charged a little i took it off airplane mode and where the service was it says searching and still does til this day. I went to best buy they didn't know why so I got a new sim it worked for like 10 mins and then stopped and i reset it multiple times and reset the network settings and everything. I found out online that their was a bug when putting phone in airplane so should i just wait for ios11 to drop because i know new updates fixes bugs or should i go to the apple store as soon as possible?

Broken?

Not sure

Bad SIM tray.

Head to the Apple store

That happened to my phone i went to multiple stores to fix it they said the intena was broken so theyd fix it it worked for about 2 days then stopped when i went to aplle they said they knew what it was and it would take 420$ with tax to fix it a year later it still doesn't work so i just bought a new phone but at least my phone works now