If your smartphone doesn't have these option, there are some free apps available for download that also allow users to list all of their emergency contacts.

Not sure how to add text to your smartphone photos? Try these options, from basic markup to creative fonts.

Satellite messaging and emergency contact details are lifesaving features found in modern smartphones.

Add Contacts: Select the contacts whose calls and messages you want to hide. Customize Notifications: Set up customized notifications for each contact.