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Can not send a message
Check the status of the network.
Can not receive a new message
Check whether the network condition is OK and then check whether the
Inbox is full. If you turn off the Auto Delete Inbox function, you may not
receive new messages when the inbox is full.
You should delete some messages and change the settings by selecting
Menu > Messaging > Settings > Message Settings > Auto Delete
Inbox from standby mode.
Can not answer an incoming call by the headset automatically
Check whether the Auto Answer function is enabled by selecting Menu >
Settings > System > Call Setup > Auto Answer from standby mode.
Can not establish Three-Way Call
Check the network condition and whether you have applied for this service
from your network provider.
To dial an emergency call
You can still dial an emergency call even if the keypad is locked. Please
enter the emergency number directly and press the Send Key.