What does the ANI feature of enhanced 9-1-1 do?

The ANI feature, or Automatic Number Identification, is designed to capture and transmit the telephone number of the caller when a 9-1-1 call is made. This information is vital as it allows emergency responders to quickly identify the source of the call and initiate a response, even if the caller is unable to communicate their location or details about the emergency situation.

While the options referencing caller identity and language translation are important in the context of emergency services, they do not accurately describe the specific function of ANI. The feature does not lock the caller's phone or provide real-time translation, which are unrelated to its core purpose of identifying the phone number of the person calling for assistance. Therefore, the correct choice, which pertains directly to the function of ANI, is that it shows the caller's phone number.