Out here in the boonies, TH 3G+ has just started appearing in my list of available networks (along with TH GSM & TH-DTAC). AIS EDGE is ridiculously slow, and I am desperate for a decent internet connection. Who is the provider for TH 3G+? If I switch, can I keep my existing AIS number? Thanks.

I think it is TrueMove H, which means CAT is nearby (52000 is definitely TrueMove H/CAT 850 MHz; I see 52000 sometimes, and 3G+ sometimes on different HW and location.)

In the past a TH prefix has meant AIS (TH-GSM, TH-1800, the latter being DPC), but most say this TH 3G+ is actually a new broadcast name for TrueMove H/850 MHz.

Maybe talk with neighbors or try a TrueMove H SIM. If it works then you can port your number.