Its show time! Armed with:
1. Vodafone SIM card
2. Telecom XT SIM card
3. Option Globe Trotter GE441 Quad Band UMTS data card
4. Pocket knife (for SIM card changes)
Follow my progress over the next few days as I compare the two using one device that supports both 900 & 850 (+2100 of course) 3G bands.
 NB: these speedtests are not about who is faster - keep in mind Telecom's XT network is still new and far from as loaded as Vodafone. But I hope the results will be useful and interesting, and it's great to have a device that does both networks YAH!