A: 1) As each preceding member posted, if you unlock your phone, the whole process is to "free" the network barriers or restrictions, which will then allow you to use any Other Networks' Sim Card. 2) In addition to what I've said, you can use your "now" freed or opened or unlocked phone with ANY Network SIM card, as long as it requires a SIM card.
So, if you're Verizon (not too significant for this purpose) locked phone needs a SIM card to function, then, all the best. Conversely, if the phone is Locked to Verizon and Requires no SIM card, you can forget about that part.
Hope this helps you in solving your problem, Emily S.