Every year EA releases a mobile version of FIFA. You can download the app for free and play it for free. Of course you can do some in-game purchases, but those are not necessary if you buy coins with the comfort trade method for iOS or Android. This way you avoid paying way to much for Android FIFA coins or iOS FIFA coins. We have tested both apps and have done a lot of purchases with external FIFA sellers. We also check daily for the best iOS and Android FIFA Ultimate Team app prices.
Best method for iOS
If you are playing the app on an iOS tablet (like an iPad) of mobile phone (iPhone and such), you can check the best Comfort Trade prices iOS here:
Best method for Android
The best prices for Android FIFA comfort Trade coins are: (this tabel gets updates once a day)