No Service with new sim- Iphone 7
I have just bought a fizz sim card and activated it today. It shows 'No Service' on my phone, but works perfectly on my friend's phone (also iphone 7). The point is his sim card, Chatr carrier, also works on mine. So it means that Fizz has some kind of restriction on my phone since in the Network section is shown 'Phone Not Allowed'. I have used different sim card providers in Iran (where I bought the phone in the first place) for 5 years and they worked just fine with my phone.
I have contacted apple store and they said that the problem is with the carrier, not the phone.
I really don't know what to do. If the problem continues, I have to cancel my plan and choose a carrier that provides connection with my phone.