I'm a sprint customer as well. It appears that we all have the sprint network, so I don't know why they're calling. Since my first post they've called 5-6 times each day, using both this number and an "Unknown" number. On the 847 number they sometimes leave voicemails with nothing but static and voices in the far background, sounded like yelling. Either it's Sprint calling, which I doubt, or maybe it's a competitor calling sprint customers to try to get them to drop Sprint due to annoyance. Could be a Sprint employee that's pissed at sprint using a dialer to do this with numbers he/she copied down perhaps. I'm going to call Sprint and speak to as many Supervisors as it takes find out where this number's coming from.
My husband received a call from this number on his cell phone and then a voice mail. While he was checking his voice mail my cell phone rang with the same number. I did not get a voice mail. All that was on his voice mail was static and like someone was there but not talking.
Something very similar happened to me as well. My wife and I were traveling and I received a call from this number. I let it go because I did not recognize it. Then, IMMEDIATELY after my phone stopped ringing, her phone started ringing and it was from the same number. They continue to call my number every week or so. When I call back it sounds like someone picks up the phone but doesnt say anything.
I just got a phone call from this number. I was going to let it go to voice mail and decided to answer it just in case. There was no one talking to me, but there was conversation in the background in a language I couldn't understand. (i.e. not English)
Soon after receiving a call from this number, I got another phone call from an "Unknown" number. The same background noises were heard and the lady talking to me had an accent similar to that of a Hindu friend of mine.
I could barely understand her when I asked for details on who it was and why they were calling. All I got from what the caller said was that the phone owner's contract with Sprint was up if I could give them the owner's contact information she would contact them directly. I told them I wasn't comfortable with that to which she said "OK" and I hung up.
I had the same experience as above but did not answer any of the calls as I was in the middle of dinner. The "Unknown" caller called every 30min. and until 10:30pm but left no message.