If the number is unlisted, or cellular, you're out of luck without either hiring a PI, or obtaining a court order for release of information from the phone provider (won't happen without a criminal investigation).
BuyVM - OpenVZ & KVM Based VPS Servers - Chat with us
- All popular VPN methods supported
- Affordable offloaded MySQL & DDoS protection
- 5GB backup space, unmetered private LAN bandwidth & native IPv6 included. All with a strong serving of pony