1. Google Opinion Rewards
The app is launched by the Google. Its free to download from the Google Play Store. Once downloaded the app, please go ahead and register using the Google account. You will have to fill in the first survey form that will be sent to you.
The app will send you survey in weekly basis and you just have to answer the survey. Once you have answered the survey, you will get the money in the Rewards app. You can make use of this Rewards in Google Play Store. You can buy Apps, and any movies, Books available in Google Play.
This is one of the Best apps to earn cash in Mobile Phones.
2. Tez
Another good app to earn cash by sending and accepting payments in Tez. The app also is manufactured and marketed by Google. The app lets you send and accept payments to and from the registered Tez users.
The idea is very simple. Just register and download from here.
And once you have registered, add the first bank account and just transfer Rs 51 to any one. Once transferred the cash, you will receive the scratch card. Scratch on the card and you will get your first earning.
3. FreeCharge
Another app that will allow you to earn some money is the FreeCharge. When you are the registered member of the FreeCharge app, you will get a coupon every month to recharge your phone, and this coupon is 100% cash back. And also keep refering your friends, and keep earning.
The FreeCharge app is from SnapDeal, and you do not have to worry about anything on the phone. This app will not steal any of your personal info and will certainly make you happy.