✔ 最佳答案
1) CSL is the brand of PCCW, such as 1+1 or One2Free, they just is the brand for different class people to us the service from PCCW. And CSL is the premium brand from PCCW from past to now.
2) SMS is still need to pay. Because it has seperate different channel to charge on it. And this is the marketing method to gain more profit from an organization.
Hope it can solve your problem la~