You can customize the lock screen in Settings > Personalize >
Lock screen shortcuts to show your four favorite apps.
Status and notifications
Status icons
Here’s what each icon means:
Signal strength
Battery is very low (10%
remaining)
3G connected Silent mode
3G in use Vibrate mode
1xRTT connected Microphone is mute
1xRTT in use Speakerphone is on
Roaming
Wired microphone headset
connected
No signal Wired headset connected
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