If the Motorola Backflip is free from network restriction or locked to the same network of your SIM card, you can definitely use it with the same ISM card. If the Motorola Backflip is restricted to some other network, you need to use a SIM card from that specific network only. To make your Motorola Backflip work with any network, you need to unlock it using unique unlock code. You can get the unique unlock code for a Motorola Backflip from SuperUnlockCodes.com at affordable cost with an easy unlocking guide. Good luck.