Sign in to My Sprint with an authorized username and password
Select your device or number from the 'New device to activate' area.
Back up your device content and contacts if necessary. click 'Continue'
If your new phone is displayed, confirm it and continue. If the info displayed does not match your new phone, enter device identifier info: (DEC, HEX or IMEI).
Review your plan choice and add-ons (this is a great time to add TEP if you don't already have it)
Power on, set up your new phone, make a test call, and check that data is active
If you encounter an error message at any point during the activation you may be able to chat for assistance. When chat is available, you should see a 'CHAT' bubble on the right hand side of the window.