Sprint’s website features a “Check Upgrade Eligibility” link that might reveal your personal information to anyone with your phone number and billing zip code. Simply enter your information here and see if your information has been compromised. This is just one more reason you should not use Sprint as a wireless provider.
WNPP (Wireless Number Pooling Portability) AKA LNP (Local Number Portability) is an FCC regulation that requires cellular providers to allow for anyone to take their number with them to another carrier as long as the number doesn’t cross zip codes or change telephone exchanges. (e.g. 262-555-1212 could not be ported to 715-555-1212 really your just porting the last four of your number) so if you move because your carrier doesn’t cover your newly found home and decide to keep your number it is likely to be long distance for incoming local callers. This should be especially considered by anyone using their cell phone for business.