Final answer:
Stay on the line with the dispatcher until they tell you it is okay to hang up, as this is critical for ensuring the best possible assistance.
Step-by-step explanation:
When you phone for help, you should stay on the line with the dispatcher until the dispatcher instructs you to hang up. Remaining on the call allows the dispatcher to gather all the necessary information and provide you with vital instructions or support until assistance arrives. It is crucial to follow their guidance and not to hang up until they say it is okay to do so, as prematurely ending the call could result in delays or misunderstandings.