I am really tempted to purchase an AT&T GoPhone Lumia 640 to replaced my Lumia 635 on Cricket. I know that VVM does not work out of the box on the non-Cricket variants, but I was wondering if I could possibly flash the AT&T 640 with Cricket's 640 firmware? Having VVM isn't a deal breaker, but, I'd really like to have it working. Any help or advice is greatly appreciated!