2012-04-03 03:02 PM
Hi, are you able to access the internet? Are you have same reason with Wi-Fi and Mobile Network?
If the answer is yes, suggest factory reset phone and try again.
Settings>Privacy>Factory data reset. This process will erase phone data completely.
2012-04-03 03:05 PM
Hello, Also make sure that you have Background data Traffic enabled. Other wise you won't be able to sign in Google.
To do that, Go to Settings- Accounts & Sync- Here Enable "Background Data Traffic". Restart the device and check again.