How To Set Custom SMS/MMS Notification Tones for a Contact

Objective

Open the messaging app (Messages or Anywhere)
Tap on the conversation with the Contact for which you want to set up a custom notification tone
Tap the three dots in the top right corner of the screen, then:
- For Messages, tap Details
- For Anywhere, tap People & Options
Tap Notifications
- For Messages, tap Advanced
Tap Sound
Choose a Sound, and then tap OK
- On older Android devices, instead of tapping OK, simply tap the back arrow

These steps will also work for a 'Group Conversation' in Android Messages, but not in Republic Anywhere.