The short answer
Check the exact IMEI, supported model, voice capability, and eSIM or SIM process before activating.
Step by step
Confirm that the phone is carrier-unlocked and record its exact model number and IMEI.
Run Verizon's current compatibility checker rather than assuming that an unlocked U.S. phone is supported.
Install current software, back up the device, and obtain number-transfer details if keeping a number.
Activate through the supported SIM or eSIM process while the old line remains available.
Test voice, texting, data, voicemail, hotspot, and emergency-address settings before ending old service.
Before you finish
Keep screenshots, receipts, chat transcripts, confirmation numbers, and the first bill after a change. Carrier terms and account eligibility can change, so verify the final price and conditions directly before submitting an order.