Wireless Internet For Office in Delhi

[vidar]

Hi guys,I am looking for a Wireless internet service in Delhi, i have little knowledge about the services, technology and feedback for wireless services here, been using BB only.I mainly need it for the Office which is in Delhi and sometime when i am on the move say like 15-20%.There are many options like TATA photon, Reliance Netconnect, MTS, MTNL etc.Then there are options of taking a sim card and a 3g modem and using 3g services. Someone also told me u can activate 2g pack of like 2gb for Rs.99\- and will get speed of 3g in sim card. I would like to ask can i avail this same thing if i have 3g in my phone or do i have to buy a separate 3g modem?What's the difference b/w 3g modem and 3g phone when i can tether the net to my laptop?Please provide me feedback and suggest me which service should i opfor.Which can be economical, Provide satisfactory service and good speeds.RegarsVidar