Freedom is an app which enables free in-app purchases provided by the google play store. One important point though, is that you must have your device rooted before using this app. If you don't know, what rooting is, then you must first search it, collect some information and then root your phone.
1. Install the downloaded apk file in your phone (Links given below).
2. First go to step 7, if freedom works then its all done. If it doesn't work then follow the below steps in sequence.
3. Download and install Market Unlocker from here.
4. Open Market Unlocker => Tick Enable Unlocker
5. Now, swipe over to the left (Market Tab) => Scroll until you find Russian MTS 25001 => Select it
6. Go to Settings => Date & time => Select time zone => Moscow (Optional).
7. Open Freedom => Choose any app or game => Wait for the process => Enjoy free in app purchases.