on 30-05-2020 10:51
on 30-05-2020 11:09
If the sim works in another phone @Emma_giggles95 I wouldn't think it's faulty.
There are various fixes in this guide. Work through it and see if it resolves the issue
on 30-05-2020 12:01
One thing I did not see in that useful guide that @Cleoriff shared was how to clean the Sim card contacts (similar to when your bank card gets a bit grotty in your purse or wallet)
This articles has some pics about doing this, about half way down:
Good luck, @Emma_giggles95
Only difference I would make is to use a good, clean, Staedtler (or similar) white plastic eraser first, then the ink eraser if that fails to work.