You need to subscribe short message pack and the charged in accordance to the fee payable under the prevailing price of each SMS. Inter-network SMS is text SMS sent within Hong Kong to users of other Hong Kong networks. International SMS is text SMS sent within Hong Kong to users of overseas networks. The charge for each Intra-network SMS is $0.3 and the charge for each Inter-network SMS is $0.6 per; $3 per International SMS. Each SMS holds 160 English or 70 non-English characters, including spaces and punctuation marks. If the SMS contains both English and non-English characters, the limit of 70 characters shall apply. If your message exceeds this limitation, it will be transmitted in form of multiple SMS and each SMS will be charged.