Can an unlocked Verizon iPhone 6 Plus work on AT&T or T-Mobile?

I found a decent deal for this republished phone and I'm about to pull a trigger because iPhone 6s Plus is just insanely expensive $820 for just 16gb version. Any feedback a are appreciated, thanks guys.

As long as your phone is unlocked, it can be used on AT&T or T-Mobile.

Don't buy such an expensive phone and that too refurbished, i think brand new would be cheaper than it and In case you want to have some advanced security app do install Leo Privacy Guard in your device to make it totally secure.