Hi everyone, I was hoping if anyone knew how to fix my problem :/

I just replaced a terribly broken screen by myself and everything is working fine, except for the sim card! It's not reading it.

I'm baffled because I don't know if I screwed up any connections? If so, how do I fix it. I managed to get the touch screen working, power button and volume buttons and everything but it's not reading the sim card o_0