A Vodafone release here today said it was offering data transfer speed of up to 21.1 mbps from the 3G mobile wi-fi device, which would be available at Rs 2,399.

The company said the mobile wi-fi would be available in Mumbai, Delhi, Kolkata and Chennai and would be launched in a phased manner.

The mobile wi-fi devise allows sharing of a mobile broadband connection with up to 10 users through standard wi-fi operation and can be connected without a power source, it added.