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Currently, you can add additional location reminders by entering a specific street address.
The iPhone User Guide below explains how to use Reminders on page 156:
Reminders can alert you when you arrive at or leave a location.
Add a location alert: While entering a reminder, tap , then turn on “Remind Me At a Location.”
To use a different location, tap your current location. Locations in the list include addresses from your personal info card in Contacts, such as the home and work addresses you’ve added.
To use a different address, tap Enter an Address