Are you using Airtel locked Blackberry mobile phone - you can unlock Airtel Blackberry and use the SIM card of any other cellular services like Vodafone, Reliance, Tata Indicom or even outside India.
BlackBerry mobile phones are particularly popular among professionals who are constantly checking their email accounts. With Playbook, RIM has expanded the BlackBerry brand to tablets as well.
Like Hutch Vodafone and Bharti Airtel, Reliance is also offering Blackberry mobile phones for GSM and CDMA.
Looking to Buy a Blackberry in India. I bought a BlackBerry Curve from Airtel India - here are the plans they offered for Blackberry. Compared Airtel BlackBerry with Vodafone and Reliance and decided to buy one from Airtel.