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Connect HTC Desire 700 dual sim to computer
Open "HTC Desire 700 dual sim"
Open "Internal Storage"
Open "Ringtones"
Drag your ringtone into this folder
Back to "Internal Storage"
Open "Notifications"
Drag your notification sound into this folder
Swipe down from the notifications bar, tap the "Settings" icon
Scroll down and tap "Sound"
Tap "Slot 1 Ringtone" to change the ringtone of SIM 1
Choose the ringtone just put in "Ringtones" folder
Tap "APPLY"
Tap "Slot 2 Ringtone" to change the ringtone of SIM 2
Choose the ringtone just put in "Ringtones" folder
Tap "APPLY"
Tap "Notification sound"
Choose the notification sound just put in "Notifications" folder
Tap "APPLY"