Verizon S6 with AT&T SIM

[AC Question]

I just bought a Verizon S6 and I put my AT&T sim into it. Now I have a few questions regarding this:

How do I know if I am using 4g? and have all AT&T bands?

How do I get rid of the 'Not a Verizon SIM' pop-up?

How do I update to at least 5.1.1 or even Marshmellow? I get a 'Service unavailable' message when I try to search for updates...

 

[Gaston Garcia]

Hi. The way to get rid of the "Not a Verizon SIM" is by going into Settings and adding AT&T's APN settings.

As far as all the AT&T Bands, I'm sure you're using everything fine, and also that you'll get 4G fine too.