BSNL and IMImobile have announced that their personalized ring back tone service (PRBT) has passed the 2 mn users milestone. IMImobile and BSNL partnered in April 2007 and have added record 20,000-30,000 new subscribers every month. A million new users were recorded in a record time of just 52 days. IMImobile provides a comprehensive technology platform and region-based content to BSNL in 8 circles of North zone covering Jammu & Kashmir, Himachal, Punjab, Haryana, Rajasthan, UP East, UP West, and Uttarakhand.