I searched the forum and even checked on the DTAC, TrueMove, and AIS websites but got even more confused as what will work in Chiang Mai. In the forums, people say the 3G frequency is 850Mhz. The carrier websites also lists 2100Mhz with DTAC being even more ambiguous with "Tri-Net".
My questions is "For those who are in Chiang Mai : What is the 3G frequency in Chiang Mai with the most reliable coverage in the city? We will be on a prepaid SIM except one of us in the group has a phone that only does UTMS 900/2100"?
Thanks in advance.