Hi Pear10987,
If you are having difficulties with Game Center on your iPhone, I would suggest troubleshooting using the steps in the following article -
Using Game Center
http://support.apple.com/kb/HT4314
Specifically these sections -
If you have an issue with a Game Center game:
- Make sure that you have the latest version of the game. To check for updates, open App Store and choose Updates.
- Test your connection using a different game. If you can't connect with a specific friend or player in multiple games, they may need to check their Wi-Fi connection and router settings.
- On iOS, try opening the game from the Home screen, rather than from within Game Center.
- If you can't create or sign in to Game Center from within a game, create or sign in to your account using the Game Center app.
- If the issue persists, or certain features of a game aren't working as expected (leaderboards, achievements, and so on), use the App Store to report the problem to the developer.
Report an issue
Report an issue with a game:
- Select the app support link. The link is on the right of the app's information page in the App Store, beside the app name and description.
- Use the developer-provided support website and resources to investigate known app issues or report your app experience.
Thanks for using Apple Support Communities.
Best,
Brett L