When using my iPhone, I often download apps to try out. Later, when I unlock my iPad, all of the apps I downloaded to test on my iPhone are suddenly on my tablet. Most of the apps I use on my iPhone aren't apps I use on my iPad, so I have to go and delete them all. Some people prefer the automation of all their apps showing up on all their devices. But for me, it's a problem; here's how to stop apps you purchased on one device from downloading automatically on your other devices.