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It is simply the phone promotion type you are on. It does not cost any extra to change the promotion and will probably work out calls per minute are less than the one you have.
So you need to telephone the provider and ask for your promotion to be changes to one where the expiry date of the calling card lasts for one year. It is much simpler to get your tg to do this for you as the operators english is not usually very good. You then need to go buy another 50 baht of credit and heh presto you get 1 year credit period.
I tried to do this for Denpar but it failed, decided it was my lack of Thai and a non understanding, so got my gf to do it for me and simple, he now has 1 year credit for however much credit he buys, 50bht or 300bht.
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If I havn't done it already, then i'm gunna do it today.
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