Same situation here. A physical sim and only a mediocre Verizon signal. I tweaked a setting for data roaming which was previously off and so far so good, fingers crossed.I'm not experiencing any wifi/cellular connection issues on my 13mini on Verizon since 15.2 or 15.2.1 and I haven't yet had an issue on 15.3 RC. I use a physical SIM and my home doesn't have great cell signal either.