How to get free gems on dragon city for mobile?

I wanna try to get it from my iPhone but the file goes to my instamusic, is there a way I can do it from Cydia, or something? Please help me.

You can get iAP Cracker to get free gems, how it works it you tap on one of the options to buy gems then tap cancel and it will still give you the gems at no cost!

Here's the newest Dragon City's Hack:
http://gameanarchy.org/dragon-city-hack/
it works perfectly so far