How to use tmobile sim on verizon S5?

[AC Question]

I got a s5 from someone and I called verizon and they say only verizon sims would work and I can't seem to find anything about using a tmobile sim. Whenever I insert the tmobile sim it just says unknown sim, and no unlock code or anything.

Some people say they got theirs to work online just by putting in the sim but thats not happening with mine, i changed the network mode and apn settings as well to no effect.

Please