I bought a new unlocked phone with no included sim card. Can I go to a Verizon store and get a new sim card and transfer my Verizon phone number to the new phone?
Does the existing SIM card in your current phone fit in the new phone? Otherwise, yes, you can visit a corporate store and get a new SIM card for the phone.
Unless your current SIM is difference size you can just switch t to the new phone. Unlocked? Like not a Verizon branded phone? Better make sure it actually works on Verizon. Which phone is it? As Ann says go to a CORPORATE store not one that says "Authorized Retailer or "Premium Retailer" they will charge you for a SIM. Corporate stores won't.