Song - Teri Yaadon Mein
Film - The Killer
Singer - K K, Shreya Ghosal
Lyricist - Jalees Sherwani
Music - Sajid, Wajid
Artist - Emraan Hashmi, Nisha Kothari, Irfan Khan
Music On - T-Series

Set it as your caller tune - http://goo.gl/Ghj4rQ