Help Need input on what to do, used gravity box and tried to change my internet usage from lte, to 4g


I think I fried my Sims card, connection bar shows a circle crossed out and when I try to choose my vpn as Verizon it won't re connect, I am using a straight talk phone, need help, if not fixable, would it be the Sims card that is messed up, and if so can I buy a Sims card from straight talks plan to switch users, and since my phone is rooted, would it still let me use my phone? Help soon please phone is a Samsung core prime model sm-s820l
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