Supernatural Episode Details!

Episode 3x14 "Long Distance Caller"

Sam and Dean hunt a Crocotta, its goal is to get people to kill themselves and then take their souls. To do so, it communicates via phone and computer as a dead loved one. Dean gets information on the demon holding the contract on his soul from a seemingly unlikely source. While Sam goes to confront the Crocotta, Dean unknowingly prepares to ambush an innocent victim.

Source: SpoilerFix