In short, MioPocket is the problem. For Moovs, we recommend unlocks from
[Please Register or Login to download file] . Other nice unlocks can be found at
http://www.navitotal.com/forums/forumdisplay.php?140-Mio-Device-Unlock.
A word of
caution is at his place. Moovs come in some variations. Worst case scenario : a wrong unlock can brick the device and you have a beautiful paperweight with a flashing screen. Thus I suggest you wait a bit until Fatboyfun has seen this post. He knows about unlocking Moovs. He can guide you better trough this.
Edit: Oops, he beats me :O