Sprint HTC Touch Pro2 in UK

[whyster]

Hello all,
all very new to these CDMA / GSM dual capability of the new TP2. We will be travelling from the USA to England in january and would like to use a prepaid SIM card to make calls home... In order to do that, can I just call Sprint and have it unlocked?

or should I use http://rhodiumw.htc-unlocks.com/ ?

Thanks.