How to verify if an SMS is sent by the Housing Authority?

Short Message Services (SMS) sent by the HA 

If there is any information related to HOS 2025 and/or GSH 2025 (including notifications of the flat selection date, etc.), the HA will send one-way message(s) using the SMS sender ID “#HKHA-HOS” / “#HKHA-GSH” to the Hong Kong mobile telephone number provided by the applicant in his/ her application form.