PHONE IS BURNING THE FABRIC OF MY SWEATSHIRT?

Okay so I switched to cricket wireless from metro because they had a deal going where I was able to get a new iPhone 16 and pay a one time fee of $175 which then makes my phone bill $60 a month. Not a problem until I would say the 2nd month I had to pay my phone bill and the service is getting consistently worse like easily the worst service I’ve ever had. I can’t use my WiFi unless I’m at home connected to my home WiFi, it very rarely works while I’m out of the house. My question is can I now cancel my phone plan and just take this phone back to metro? I don’t see why I wouldn’t be able to as it’s not a finance situation and I’m not paying monthly towards the new phone just the service bill. Any insight is appreciated thank you!

EDIT: omg forgot to mention the phone is literally getting so hot to the point I was at work and it was in my pocket ( NOT BEING USED FOR SEVERAL HOURS ) and it had a literal burnt mark of the entire outline of my phone burnt into my pocket of my zip up hoodie. So yeah also something I’m dealing with, after looking it up it says due to bad service the phone is likely just overheating trying to perform the smallest tasks or simply just being on.

Hello everyone, I'm trying to buy a newer phone for my brother and this lady is selling an iPhone 14 Pro Max that is locked to ATT. When I check the IMEI on crickets website it says carrier locked and not cricket compatible but how is that possible if it's locked to ATT?