Support Can't sign in to my Google account.

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http://androidforums.com – Hey Guys, I have a weird issue that I can't seem to figure out. I am using Boost Mobile and have a Samsung Transform Ultra. The problem I'm having is that it won't let me sign in to my Google account because the email address I've associated with my account is a yahoo! account. It says [email protected] does not use Gmail. Why is this? I came from Sprint with an Epic Touch and it used that account just fine. Any ideas? (General)