How can I sign out from gmail in my Android? Possible Duplicate:
  How-to unlink the main Google account from android device without a factory reset
  Logout from Gmail on my device  




I have a Sony Ericsson Xperia. I have logged in on it with one of my Gmail accounts.
But now I want to change the default gmail account logged in on my phone. How can I do this?

Thanks.
Menu button --> Settings --> Accounts and sync--> find your google account there (enter inside)--> remove account...

You cannot remove the account if it is the last google account on your phone, you will have to add a different account before you remove it.