Q: I just brought an iphone 4s from someone and there apple id is on the phone how do i delete and install my apple id

CHANGING APPLE ID/EDIT ACCOUNT INFORMATION/CHANGE ITUNES COUNTRY

Tap Settings / iTunes & App Stores, then tap the Apple ID signed in. Sign out of the current Apple ID account and then sign in with another account or create a new Apple ID http://support.apple.com/kb/HT2731?viewlocale=en_US

Go to settings/facetime and tap the ID there and log out and log in with new ID.

Go to settings/messages and turn off imessages wait 30 seconds and turn it back on, go to “receive messages  at” tap on the ID there, sign out and sign in with new ID.

Go to settings/icloud and delete the account and when prompted select “keep information on your device” then turn it back on with the new ID.

To edit account information tap Settings / iTunes & App Stores / Apple ID: / View Apple ID

To change your iTunes Store country, sign in to the account for the iTunes Store region you would like to use, tap Settings/iTunes & App Store/Apple ID/View Apple ID/Country/Region

Read this article for information http://support.apple.com/kb/HT1311

Restore the iphone.

Click Support at the top of this page, then click Manuals.  You can find the manual there.

See  Erase your device  Here  >  http://support.apple.com/kb/HT4137

Go to Settings > General > Reset > Erase all content and settings

Also... See the wjosten post here...

https://discussions.apple.com/message/20294697

This should have been done by the Seller...

What to do before selling or giving away your iPhone, iPad, or iPod touch