Regarding to your inquiry, Please be informed that if you would like to cancel your Dtac number, it has to be done at Dtac service hall only. Your passport must be presented and outstanding bills must be paid on the same day. In case if you’re not currently in Thailand .Kindly settle the bill of 3,500.76 Baht (excluded additional packages, IDD or IR usage) .Please be informed that we can not cancel the number for you but we can change your number to prepaid service and the prepaid number will expire itself after 45 days if it’s not refilled. Kindly contact us again to confirm your request.