Call customer service or visit a store in person to disconnect a line. Be prepared for a sales pitch or incentive offers to stay, and if the line is still in contract or on a device payment plan, you'll need to pay the ETF fees or the balalnce due on the phone. If you are planning on moving to another carrier and want to keep your phone number, DON'T cancel, just go to the new carrier and ask them to port your number. The port process will automatically cancel your Verizon account.
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