What phrase should you use when calling for help?

Using the phrase "I need help, call 911" is effective because it clearly communicates the urgent need for assistance and specifies the action that should be taken—calling the emergency services. This direct approach ensures that those responding understand that immediate action is required and that they need to contact trained professionals who can provide emergency medical care. It eliminates ambiguity and allows for a swift response, which is crucial in emergency situations. Other phrases, while possibly conveying urgency, may not explicitly instruct someone to contact emergency services as clearly, which could delay necessary help.