My iPhone 6 keeps telling me "activation required"

[DrumsOfGrohl]

My phone has done this twice in the last week. I just updated today to the new iOS 8.1.2, so I'm hoping that might fix it, but I was wondering if anyone else has had this issue.
I just have to connect to the internet and enter my apple ID info, and its back to normal. But it gives me this message. I have Verizon, and I don't (think I) have a SIM card....

 

[scifan57]

Verizon iPhone 6’s have use SIM card for international roaming. Maybe, if you don't have one, you could ask Verizon and once inserted, the message probably won't reappear.

 

[DrumsOfGrohl]

What would I need one for?

I haven't used roaming since I got my 6, and I don't currently have any plans to leave the country....

 

[scifan57]

What would I need one for?

I haven't used roaming since I got my 6, and I don't currently have any plans to leave the country....

I just thought having a SIM card in the holder might stop the notice you keep getting from appearing.

 

[DrumsOfGrohl]

Ohhhh. thats not a terrible idea. I'll look into it.