Not sure if this app is for Apple but it works great for Android. I have gotten two $1 amazon gift cards for just having my lockscreen on my phone have an ad on it. It isn't too invasive and you can get a $1 card every 10 days. They also have some easy surveys that you can get even more.
Check it out at:
https://goo.gl/Qckw5e
S'more is a lockscreen rewards app that allows you to earn points in exchange for us placing ads and content on your lockscreen. Every day we'll give you points in exchange for having the S'more lockscreen installed, and regardless of how many times you see it, you'll have points added to your account. Just use your phone normally, and get paid. Want to earn even more? You can also complete paid surveys and offers, and use the refer a friend feature to get more points. Once you've earned points you'll be able to redeem them for gift cards from retailers including Amazon.com, Target, CVS, GameStop, Starbucks and more. Last step? Spend that lockscreen cash!
Here's how it Works:
Earn Points
•We'll show you relevant content and ads on your lockscreen.
•To dismiss the ad and access your phone, simply swipe up. To learn more, tap the ad.
•You earn points every day regardless of the number of ads you see or click on.
•Redeem your points for gift cards from retailers, then spend that lockscreen cash!
Paid Surveys
•Complete surveys for points above and beyond your lockscreen rewards.
•Receive points for every survey started, even ones it turns out you’re not eligible!
•Complete as many or as few surveys as you like.
