Intra Network => Free
Other Mobile Network => $0.50 / SMS
Effective 1 Oct 2016, Intra-network SMS is text SMS sent within Hong Kong to 1O1O, csl and SUN Mobile customers and is subject to a quota of 10,000 SMS units per calendar month ("Quota"). Unused Monthly Quota units cannot be carried forward to the next month and will be forfeited at the end of the relevant month. If the usage exceeds the Quota, the Thereafter Charge is $0.2 per Intra-network SMS. Inter-network SMS is text SMS sent within Hong Kong to other Hong Kong networks. International SMS is text SMS sent within Hong Kong to users of overseas networks. The Quota does not include Inter-network SMS and International SMS.