Sprint calling regarding past due bill.  

Interesting.
That is a VOIP phone number.
Do you really think Sprint Customer Service uses VOIP numbers?

I called sprint directly and they said its probably SPAM! Don't pay your bill with these people or the 1-888-335-6369 number either!! Call sprint directly and ask what's going on. It's a scam!!

Stated they were Sprint calling about a past due bill and would be cancelling service within 48 hours if not paid. Wanted me to pay at that minute by pressing 1. Contacted Sprint directly..they said there is no cancellation of service notice..THIS IS A SCAM!!! DO NOT PAY THESE PEOPLE

Plus they know my zip code...Tried putting a "fake " zip code in..But they knew that it was not mine...Yikes!!!