Fred is going to be changing his service to T-Mobile and he wants to know if he can connect the old phone with the new phone and transfer everything via Bluetooth. Leo says it depends on whether or not there's app support on both the phones. Motorola and HTC have migration apps that do just that. Not everything, but critical things. Both phones have to have it, though.
If they're running different operating systems, he will probably need a computer in between. Leo also says he can use SkyDrive between the two. Upload to the cloud and Fred's Lumia Windows Phone will grab it back down. DropBox will work as well. Bluetooth is generally not used for file transfer as much as it is for audio.