I bought an iPhone and the guy s number is still on it.what do i do?

Can i call verizon and ask them to get a hold of the guy to tell him to deactivate it? What should i do?

1) You are able to erase all the data on your iPhone including all of your media and information, and to default all your iPhone settings. This is particularly useful if you are selling your iPhone. Once completed you can plug your iPhone into your computer and use iTunes to restore your data and settings if required.

Connect iPhone to your computer or a power adapter. Choose Settings --> General --> Reset and tap "Erase All Content and Settings."

IMPORTANT: You can't use iPhone while data is being overwritten. This can take up to two hours or more, depending on the model and storage capacity of your iPhone.

2) Verizon associates your CDMA iPhone 4 with your cell phone service by using a built-in mobile equipment identifier (MEID), rather than a removable SIM card. Disassociating your phone from your account requires a phone call to Verizon's customer service. First, retrieve your iPhone's MEID from the Settings > General > About menu and record the value in the MEID field.

Next, call Verizon's customer service number and request that they completely disassociate your phone from your account. Be sure that your iPhone's MEID is clear for use on a different account. Verizon may require additional time to process your request-possibly up to your next billing cycle-so be sure to get the official date of deactivation.