It still does default text tone for a contact as I set it to sonar tone.

Transfer Audio Files from a Windows Computer:

1. Connect the ZTE device to your computer via USB
2. Enable “media device” / “File transfer” at the prompt or from the “notification” area
3. Open the File Explorer on the PC
4. Use the Explorer to locate the desired audio files on the PC storage
5. Copy and paste the files on the phone storage, preferably in the “Ringtones” and/or “Notifications” folder(s)
6. After the transfer is done, eject the phone storage via system tray and safely disconnect the phone from the USB cord

Change the General Ringtone:

1. Open the apps drawer
2. Go to “Settings”
3. Scroll to “Device”
4. Tap “Sound & Notification” and select the desired ringtone
5. Tap “OK” to confirm
6. Optionally, select whether to turn “Also vibrate for calls” ON or OFF

Change a Specific Contact’s Ringtone:

NOTE: You cannot assign custom ringtones to contacts located on the phone’s internal memory or SIM card.

1. Open “Contacts”
2. Tap and hold the contact whose ringtone you want to change
3. Tap “Edit” > “Menu” > “Set ringtone”
4. Select the desired ringtone
5. Tap “OK” to confirm

Change the Notification Sound:

1. Open “Settings”
2. Scroll to “Device”
3. Tap “Sound & Notification”
4. Tap “Default notification ringtone” and select the desired notification sound
5. Tap “OK” to confirm