Unlocked Lumia 920 from Thailand with no LTE

[kurtd]

Anybody know how to compare specs of a particular phone to make sure it has the required frequencies for a certain carrier? I have a T-Mobile US branded lumia 925 and need to make sure 3g/4g/LTE will work on either TrueMove or AIS in Thailand. I find sites like phonearena useless since they just list all the possible frequencies for a device instead of the frequencies each branded phone has.