A lot of website offering virtual mobile numbers for india also and a simple Google search would reveal a list of these website.
I heard a app called Voxox can be used for generating virtual mobile numbers but I haven't tried it myself.
Thanks for the msg but as i mentioned before, most of those websites are selling toll free numbers. I checked Voxox and they seem to be offering US numbers only. The list which is given on various blogs is FAKE.