3G is available in Mumbai and Thane. Check the websites of respective operators.Originally Posted by gordita
To be on 3G often it is with your existing SIM this can be enabled, nothing special or different about the 3G SIM.
It is as simple as calling the operator they would start the 3G service for your existing SIM.
Even new sign ups are identical to signing up for 2G.
In your dads case he would need micro SIM and a separate connection, most operators should be able to provide micro SIMs, if not there are places where they downsize the Regular SIM,( if you don't want to do it yourself.)
Hotspots have not yet picked up so well, assume none exists for all practical purpose.
At home highly recommended to setup wifi hotspot, any wifi modem would do.
iPad supports the "n" variant which is faster, hence look for wifi modems supporting this variant.