If you want to add another Verizon line to a dual SIM phone, you would purchase another line/service plan and then a second SIM is installed to the phone. You then pick between which number you want to use on the phone as it's like having 2 phones in one device. Some apps won't separate the 2 lines though so things can be like a catch-all bucket with those apps.
If the phone is locked to Verizon, you can't get a different carrier's SIM to work on the phone until the phone is unlocked. Then you can run a Verizon SIM and some other carrier's SIM on the phone.
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