Why does my iphone say invalid sim and etc.10.points?

My iphone 5 from verizon says invalid sim. It won't let me get on the internet or text or call away from home but when i get home it works just fine. This started happening a few days ago

Verizon iPhones don't have SIMs because Verizon doesn't use SIM cards. You should talk to Verizon about a replacement.