LTE-A implements, among other things, carrier aggregation. This allows the combination of multiple, different bands to create more bandwidth. LTE-A also implements VoLTE, which in theory will be better than current voice services offered today.
If Thailand uses the same bands, it couldn't hurt to try if you have the urge. You can always sell it.
If Thailand uses the same bands, it couldn't hurt to try if you have the urge. You can always sell it.