My Galaxy Tab pics up the True Move signal great. Looks good at only 300b p/m unlimited. It would really only be for video calls back to the family at home. But to pay you need a Mastercard/Visacard... and that's it? No other way to pay?

No need to pay 300 baht. You can simply buy a SIM card. If True H, you can simply add credit and then apply the WiFi month package for 107 baht. You get a username and password by SMS in return.

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DTAC is ฿69 (or it was when I used it last) but they don't have as many hotspots & it's a waste of ฿69 now I'm on an unlimited 3G tariff. Skype works over 3G now (on iOS at least)

Sent from my iPhone using ThaiVisa app

No need to pay 300 baht. You can simply buy a SIM card. If True H, you can simply add credit and then apply the WiFi month package for 107 baht. You get a username and password by SMS in return.

That's fantastic, thanks.

So I buy a 'True H' sim card?

Add credit. And how does one 'apply the Wifi month package'?

(My Galaxy Tab 8.9 has a sim slot, but isn't a phone)

Pop into a TRUE shop and use their phone or make a friend and use their phone.

Use the Short Code or SMS method indicated above.

But since you have a SIM slot, you may have the possibility to use USSD codes. I don't know, as I have no knowledge of your machine.