To do this you will need an ios or andriod phone.
What you do is you will need an app called feature points and basically you download apps for points which you can then redeem for microsoft points, money or games. However this takes a long time so I have created this 'mod' or 'hack' if you like, whatever you may call it and basically when you start you will be asked for a refferal code which usually gives you 50 points, however since I have a jailbroken phone I have used ifile to edit the points the code gives you, changing it to 99,000. So when redeemed you can buy as many microsoft points as you may like (Which cost 9900 points) and buy packs with them.

Here is a link on how to install feature points [ Register or Signin to view external links. ]
and here is the refferal code to gain your points: WFXP24