Talk:Thailand/@comment-42.99.164.95-20150911023340/@comment-24682153-20150911073804

It does not depend on the SIM card, but mostly on the value of the top-up that determines your SIM validy in Thailand. At True for instance a top up of 20 THB only gives you 30 days, but for 1000 THB they'll give 150 days of service.

So the easiest way to extend validity is simply to top up. This can by tricky from abroad and you may use an 3rd party agency to do it. Staying in Thailand, of course it's very easy.

Alternatively, some providers on some tariffs sell you validity extensions for a fee like 60 days for 30 THB. Normally, they are not such a good deal, as you can't use the fee as call credit. But you have to inquire at your provider, if this is offered for your particular SIM card. Have in mind that starter prices are very low in Thailand. So it may not worth spending a lot of money on extensions.