How do I change a Google account for Android mobile (Xperia 10)?
Should be pretty easy.


Just go to Settings &gt; Accounts &amp; Sync
Remove the 'dummy' account
Add the real account


You can even leave the dummy there for now. Android supports multiple accounts.

Note: I'm running Android 2.1 so the menu options may be slightly different, but the idea and results should be the same.