There are many services but this one is tested the best if you ask me.
1. Go to http://freepoints.kloaka.tv using Safari on iPhone, iPod Touch, iPadMini or iPad. Or on your Android Device.
2. Press “Sign Up!.
3. Install the Profile by pressing “Install”, this will allow FeaturePoints to recognize that it’s your device, nothing else. Press “Install Now”.
4. Start downloading any of the apps under the “Get Points” button to earn points. Apps that you have previously downloaded with your iTunes account will not count. Check back daily, for new apps.
5. Invite friends and family to FeaturePoints to gain extra points under the “Earn More” tab.
6. After you have enough points, visit the “Rewards” button to choose a prize. (They even pay Paypal Cash)
It’s that simple.
How to Redeem Paypal Cash:
How to Redeem an Amazon Giftcard: