SIM Package Call Rate Validity Period Sawasdee Mae Yok 2 baht/minute all network 24 hour 100 baht top up credit extending validity by another 30 days January 31st, 2011   Sawasdee Mae Yok call plan Customers who make a switch to Sawasdee Mae Yok call plan can carry over remaining validity days from previous call plan as many as 30 days only. Call plan switch to Sawasdee Mae Yok is 30 baht. Sawasdee Mae Yok customers are not eligible for Validity Transfer service. For customers switching away from Sawasdee Mae Yok call plan to another one, in case of remaining validity days exceeding 30 days, maximum of 30 validity days are allowed to be carried over to a new one. Maximum account balance is 3,000 baht with maximum amount of validity days are restricted to 365