Iphone SE suddenly loses cell service.

My iPhone cannot connect to Verizon cell service. It worked yesterday. My other phones work fine. "No Service". I reset all functions, and even checked my SIM card on another phone, and it worked on another phone. So it's not the SIM Card. I'm reluctant to replace the phone, but it is an older phone, and perhaps the only method. It's too bad the Apple Stores are closed, those guys were geniuses!!!!