IDEA fleeces its customers under the garb of 3G connection. I am a very old customer for idea post paid but with the billing issue I faced I will not recommend IDEA to any one else.
Even in my work place I do not recommend any one to go for IDEA even when there is a person selling IDEA connections inside the office premises.
If you want to go for 3G then buy the packs from MTNL or BSNL . They are lot better.
Also the place where I live very often the phone picks up roaming even when I am in the same city.