Finally figured out the problem. This curve is apparently an APN locked device which can only be used on T-Mobile germany for data services while voice is fully unlocked. Also, it is an enterprise only device which has somehow been hard wired into the flash rom of the device. There is no way to use BIS on this, only BES.
Sending mine back to the guy i bought it from for a full refund.
So just a word of warning, if you guys come across a cheap brand new 8300 which is unlocked, try and steer clear of the t-mobile germany handsets
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