Originally Posted by transpac

"I don't think there's anything special about the sim other than the way it's packaged and that it comes with some credit. It's just a truemove h pre-paid sim, right?"

Maybe, maybe not. It all depends on the T's & C's.

http://truemoveh.truecorp.co.th/3g/s...try/2552?ln=en

which say, among other things,

Receive a minimum of 30 days and can be accumulated up to a maximum validity of 90 days.

so unlike a standard TrueMove H SIM, which may allow for a maximum of 365 days expiry, this SIM appears to have a max. expiry of 90 days. This is why I recommend avoiding free/tourist SIMs, assuming you want to maximize expiry in case you want to keep the number and plan to return.

I maintain many standard pre-paid SIMs on AIS, DTAC and TrueMove H for friends/colleagues/spares for visitors simply by using free-standing top-up machines (found everywhere), which for 12 baht (10 baht + 2 baht fee) give 30 days up to a max. of 365 days. I just top these up at the end of every month, for 144 baht/year.