•Move away from radios, entertainment equipment, and other electronic devices that might interfere with or block AGPS satellite signals.
If your phone cannot find strong AGPS satellite signals, the location of the nearest cell tower in contact with your phone is automatically provided to the emergency response center.
voicemail
Your network stores your voicemail messages. When you receive a voicemail message, your phone plays an alert and shows the number of messages.
Find it: On the home screen, touch 
Voicemail.
Note: Your service provider may have more information about voicemail.
call waiting
If you receive a call while you are already on call, you can touch Ignore to send the new call to voicemail.
Touch Answer to put your first call on hold while you connect to the new call.
Tip: To switch between calls, touch Flash.
3-way calling
To add a third person to your call, touch Add and call the third person. When the third person connects, touch