I have someone hacking my phone and they used this number to transmit data. I didn't even answer the call. I've had a bazaar hack or 'take over' for 4 years and the hardest part was getting any help. I just got an iPhone 5 and it shows everything he's doing and they are helping me. Never call a number back! Any connection gives them a pass to your phone. If an unknown number keeps calling look it up and if it's questionable block it.
Received call, picked it up thinking it was a reference call for a friend of mine. They called me by my full name and wanted me to confirm my social, when I did not answer that and challenged her she then asked me to confirm my birth date. I refused to answer that as well and challenged her again. She said by bye and hung up. She refused to identify what company they were calling from. I have had a collection call, the caller can at least identify what company they are calling from. They do not disclose what the call is about but they can identify their company legally!
Beware folks, they may already have your information!