Sprint HTC Hero :: Can't Link Phone To Google Account

I wanted to change the Google account that my phone was linked to, so I cleared the google app. Now when I try to sign in using my google account to link the phone with the phone (the new one or the old one) it asks for my login info, then says Signing in and says it may take up to 5 minutes. Then it gives me a message that says: "Can't establish a reliable data connection to the server. This could be a temporary problem or your SIM card may not be provisioned for data services. If it continues, call Customer Care." I have called customer care and they can't figure it out. They told me I need to go to a Sprint Store that does service, but there isn't one very close to me, so I'd rather not take half a day to drive there if I don't have to.

I have full bars and everything else works great. I can get my email, use the internet and do everything else that doesn't require the use of the google account. But I can't use the google mail feature or go to the Marketplace. I'm using 1.56.651.2 and haven't really done anything else to the phone as far as changing settings or rooting or anything.