First, try entering null as password together with your Google username without @gmail.com. If it doesn't work, call yourself from another phone, answer, press the Home button and try to disable the pattern lock. Also, you can try contacting your mobile service provider and ask them to activate the Data Connection. If none of these help, you will need to perform a factory reset. Turn off the device then press Power + Volume Down for 10 seconds until you enter Recovery Menu. Select Wipe Data using the volume buttons and Power for the OK button.