We have kept it simple when sending SMS messages to a candidate pool.
Browse to Candidates -> Candidate Pool and the click on the mobile phone icon of the pool you would like to send an SMS to. You will then be presented with an SMS window where you can compose the text you would like to send.
Before you can send SMS messages, you must enable and configure this within the settings. Search ‘Setting up SMS’ on the knowledgebase if you require any assistance.