You should be able to get on WiFi even with the phone deactivated.
IF you have GC 2.7 on the old phone:
I apologize for the delay in responding.
Click on the "gears" in the lower left. Next, click "Sync Setup/Login" and enter you email address in the top bar and click "Done" in the top right.
DO NOT CLICK A RED BUTTON AT ANY TIME.
You will receive an email "App Cubby Data Synchronization Verification" for your email address. Click on the verification link.
Then, go to the "Sync/Setup Login" again.
You will have 4 buttons. First, click the "Save Data Backup". Next click "Request Data Backup Link". The last step will likely cause the app to crash. Open the app and click it again to be safe.
You should receive an email with the data back up link.
To update to Gas Cubby 3.0 on the new phone, go to Settings and "Re-run GC 2.7 to GC 3.0 Upgrade. Please see instructions on this process on this page:
http://www.fuelly.com/forums/f41/mis...ade-18895.html
If you have Gas Cubby 3.0 on the old phone, click "Set Up Sync" enter your email and Fuelly password, then "Sync All Data". On the new phone, open the app, click "Set Up Sync" and the data should transfer.