Bought this phone last week while in Thailand - thought it should work on the XT Network.

Phone is 3G,  WCDMA, quad band incl 850 MHz

Took it to Telecom, they sold me a SIM Card, but it doesn't work.

Went back to Telecom - apparantly this phone is not compatible with their SIM cards ???

Anyone know why it won't work ????

( the phone works well on Vodafone )