For those saying you need to be really late or whatever before the interrupt service
That shit does happen.
My fiance has a sprint account on her cell. For the longest time everything was smooth since I always pay bills the household bills the second they arrive. Well they offered online billing and gave a one time credit for adding it so we went ahead and did it.
This is when the problem began. Apparently there is a delay or was a delay in the online billing, so it sent the invoice out the same day as the due by date would of been on your paper bill. Very first month of using online billing and she goes to work and her cell does not function. I call in and explain the issue and pay it. Cell is back on. Later that day the invoice arrives in my email sent after I made the payment. Same thing happens the following month.
I just switched it to autopay now, but damn that shit was stupid and annoying.
P.S. Sprint has other issues with its online accounts. Little word of warning, if the site times out on you while your making a payment. Call in immediatly to cancel it. Or it will register as a NSF charge.