Us cellular phone put my Verizon son card in it and now I have a triangle over my bars. How do I get it to work to the full on

Oct 20, 2018
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My mom sent me her us cellular phone and I put my Verizon sim card in it and now I have a triangle over my bars and only 3g when I pay for 4g. How can I fix this? Or do I need to not use this phone?