PDA with Removable Mobile Phone

PDA Cellphone
I am not sure about this next device although it is still worthy of a mention. Just look at it how you will though. This patent is for a PDA which features a removable mobile phone in a hidden compartment. I am not convinced with this, especially seeing how small the Helio Ocean is which packs a ton of features including GPS and a QWERTY keyboard. Anyway, back to the PDA with removable mobile phone. This device is supposidly going to be capable of syncing with its mothership. I just dont get why it needs to exist though. Oh well