In answer to your question concerning how they could have 400 mobiles, I think it may be quite easy. Online there are sites offering temporary mobile numbers for receiving sms messages, the're often used to setting up fake facebook accounts. Sad, I know.
Thanks for the info. I figured there was a way, and yes.. it is sad that they even do this. The time taken to setup all his could be time used to create something.
so tho mobile number account creation pool is finite :) gasp