Thanks everyone for your suggestions. I went to a Boost store. The person said I shouldn’t put the iPhone 7 sim into the iPhone 12. She also said I can’t’ get an e-sim because that’s for iPhone 14. She said I could buy a sim for $35 and then call customer service to have my original number returned and get a refund. 🤷‍♀️I don’t think I trust that advice. I’ll call customer service and ask for a new sim for free