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Connect Sony Xperia Acro S to computer
Open "Xperia acro S"
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 "Phone ringtone"
Choose the ringtone just put in "ringtones" folder and tap "Done"
Tap "Default notification"
Choose the notification sound just put in "Notifications" folder and tap "Done"