if you have an iPhone 3GS or later then you have it. other wise you dont have it.
Yes
The Iphone
Yes
Open game center, goto games tab, tap "find game center games."
you dont
You can't as it comes as part of the default package of the iPhone
To open Game Center on your iPhone, go to the "Settings" app and scroll down to find "Game Center." Tap on it to access your Game Center profile, where you can sign in or manage your account settings. Additionally, you can open Game Center directly from supported games that utilize the service. If you're using iOS 10 or later, keep in mind that Game Center is integrated into individual games rather than having a standalone app.
If you delete the game it will ask if you want to keep or remove it from your game center.
Why's it matter? Get a life and get off the Iphone bro....
Game Center comes with iOS 4. You do not need to download the app. You are also unable to delete it so enjoy it.
You add friends on the game center, then you restate your iPhone and ur friends bros will show up as bros in our game... Add me "vully"
DragonVale is Game Center compatible. You can log out of Game Center on one device, and into on another device to pick up your game where you left off. I often switch between my iPad and iPhone to check in on my game. Other people can also have DragonVale games going on the same device by simply having their own Game Center log in.