I am sending this message to remind all of you: Please be careful about CHITEL calling (DA TANG KA) when you use it. It seems cheaper, but it is a lying. I have been called the customer service more than five times. Each time I use the card, it will cut me 10 to 15 minutes. My friend, count your time when you use it, and ask your time back when it is nessary. Happy holiday for you all!