You may make payment online at this site, or mail it to one of the following addresses:
Regular Mail and U.S. Postal Service Express Mail:
Sprint
PO Box 96031
Charlotte, NC 28296-0031
Overnight via Federal Express or any other carrier 1st Union Bank:
Retail Lockbox Sprint-NIBS
1525 West WT Harris Blvd,
Building 2C2
Charlotte, NC 28262-0809