Synching data between devices

I’ve seen a few questions like this floating around but haven’t run across an answer or a solution. Specifically for iOS, is anyone reliably synching data between devices? Is there a recommended method or an example? Storing on one device is easy, but how do you synch levels etc to the user’s other device? So for instance you have a Universal app and your game progress is the same on the user’s iPhone and iPad. Thanks for any pointers!

You must use some kind of service. It can be your own host or you can use some external provider. Check Google Game Center and Apple one (there are many other too)

You must use some kind of service. It can be your own host or you can use some external provider. Check Google Game Center and Apple one (there are many other too)