Weird sim problem on iPhone 7, help appreciated

[elladan123]

This morning, after taking my iPhone 7 from the charger I noticed it said "No SIM". I thought little of it and restarted it, however nothing changed. I went through the classic steps (hard reset, resetting settings, reseating the SIM etc..) with nothing helping. I decided to test it with my SO's SIM, and it worked without any problem. But then came the strange part, my SIM was working perfectly in her phone.
So here I am stuck with a SIM that works in another phone, and apparently other SIMs work in mine.
Trying to google the problem didn't help much as I haven't found any case exactly like mine.
Any ideas what options should I try next?

[YaBoiWill]

Go to your phones shop and they can just port it across with the numbers on the back of the sim. Takes about 5 mins for it to happen. 

[elladan123]

Did that, got a new SIM, which works. The guy told me that it's 100 % an issue with my phone (I'm not exactly convinced but OK) and most likely it will eventually have to be repaired. However for now, at least, it's fixed. Thanks for the advice.

[Lord Vile]

13 minutes ago, elladan123 said:

Did that, got a new SIM, which works. The guy told me that it's 100 % an issue with my phone (I'm not exactly convinced but OK) and most likely it will eventually have to be repaired. However for now, at least, it's fixed. Thanks for the advice.

My SE did that, swapped SIM and it worked fine until I replaced it. Just one of those things.