iphone 12 sim card not available

See this support article about that matter:--> If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad

If the issue persists, I suggest that you contact Apple Support directly, using this link:--> Contact Apple for support and service , or (even better) make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

Thanks for sharing that info. Maybe other Verizon customers can find it helpful.

Regards

Giulio