All of my iPhone 3GS contacts have just been deleted from my phone?

I was updating the app "SyncMe", and when it completed the update, all of my contacts were deleted from my contact list. I've deleted the app - as it obviously contains a virus of some sort - but I don't know how that could happen. What did happen?

There's no virus in "SyncMe",

Do a "restore" of your iPhone and NEVER fool around with Apps that can alter your Contacts unless you have recently done a backup.

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