I'm an Android device user. With the latest update (1.71.6), WGT has drastically upgraded the minimum requirement of OS version on which the game can be run. (From Android 4.1+ [Jelly Bean, API 16] to Android 4.4+ [Kitkat, API 19]) This made one of my old smartphones that served me only for playing WGT completely useless now.
I think they're doing the same for Steve Jobs' products.
I don't know why WGT is forcing us to go out there and buy newer devices and what good it does to them, but if you want to continue playing the game, I guess this is the only option left to us : get yourself a latest smartphone / tablet or something that meets the minimum requirement at least.
This is really stupid from a marketing strategic point of view.