My Phone Won't Read Sim Card(?)

[iamnotpartveela]

Just this year's April I went to the US on a trip to visif my uncle. He got me a sim so we could text when we were at disneyland and universal, as he took the sim card for my home country and tried to use a sim card for the us, my phone couldnt read it. It took about an hour before my phone was finally able to work with its new sim. Now that i'm back home, i tried using my old sim but now it won't work. I've already factory resetted it. I've tried using it as just something forthe internet but even that won't work, apps such as the app store and facebook keep crashing. Please help

 

[VDub2174]

Have you tried calling you carrier? They might need to do something on their end.

 

[iamnotpartveela]

I thought the same but i've tried my old sim on other phones, and it could be recognized and i can call and text. sims with the sony, though, it really doesn't seem to recognize them.