Go to your contacts list and dial 'YouMail Deactivate' to disconnect your phone.

You can also click the appropriate deactivation code below (via your iPhone) or manually enter in the numbers. 

For AT&T or T-Mobile users:
Dial ##004# and hit send to connect

For Verizon users:
Dial *73 and hit send to connect

For Sprint users:
Dial *38 and hit send to connect

**If you get any kind of errors or calls still get forwarded to YouMail, contact your carrier and say "I need to reset call forwarding"