Originally Posted by transpac

For AIS/One-2-Call and DTAC/Happy you can purchase a new SIM for 59 THB all the way up to 1 million + THB. The 1 million THB SIMs have desireable or lucky numbers. The standard package is 199 THB from Happy and 250 THB from One-2-Call. There are also many, many new SIM promotional packages (One-2-Call has ~ 12 SIM packages currently) which come with default calling values, expiration dates (30 days) and calling plans. After purchase and initialization you can change just about anything related to your SIM. You are not locked in to a promotion/package for any period of time. I have to say that it is quite consumer friendly. Also, these two providers honor promotions indefinitely even if they raise prices for newer subscribers. For example I subscribed to a monthly GPRS package a few years ago which gives me 25 hours for 100 THB (107 THB with VAT), and last year they changed the plans so that you can now get 20 hours for 100 THB. But One-2-Call still honor the terms of my plan. Rarely do you see that happen.

I suspect HKtraveler purchased two different SIM promotional packages and was unaware that either/both can be modified with regards to top-up value, expiration date,calling/messaging and data.

My calling plan is 3 THB for the first minute and 25 satang for each additional minute, anytime, to any phone.

For One-2-Call you can dial 1175 and press 2 for English-speaking CSRs, or email to [email protected] . You can get in to the Promotions menues (verify your current promotion, listen to available promotion details and change your plan) by dialing *777.