It was mentioned on twitter that this is all done through bugs in the e-mail app. Every firmware it is on from 3.52 down has these holes in it.
https://twitter.com/frtomtomdu80/status/646748111633780736
So you don't need to worry about buying anything, and won't have to worry about updating to 3.52 if you are on some other 3.XX version.
https://twitter.com/frtomtomdu80/status/646748111633780736
So you don't need to worry about buying anything, and won't have to worry about updating to 3.52 if you are on some other 3.XX version.