I am having trouble finding a SIM that will work with my unlocked Galaxy S7. It came unlocked by the factory so I know it can accept other SIM cards BUT I can't find one online that will work. They all say not compatible when I check the MEID.
My friend uses Red Pocket I believe and he has a Verizon phone as well. It is not the Galaxy s7 but it should work regardless. Just make sure you get the right one. They have cheap $10 plans as well as $35 plans.
I think that you have to expand to smaller companies. Like mentioned above, Red Pocket is a small company that supports most unlocked phones and devices.
All newer smartphones from Verizon, which use 4G/LTE are both CDMA & GSM, LTE is GSM. So Yes, it should work if the phone is unlocked with any SIM try Simple Mobile.