The mandible is a U-shaped bone. It is the only mobile bone of the facial skeleton, and, since it houses the lower teeth, its motion is essential for mastication. It is formed by intramembranous ossification. The mandible is composed of 2 hemimandibles joined at the midline by a vertical symphysis.
1 For example, AT&T charges $23 for a home residential line that includes a few additional basic features such as caller ID, call waiting and voicemail. 2  Home phone service plans that include local and long-distance calling cost $30-$45 per month.
Below is a list of toll free 800 numbers for AT&T. Orders, Customer Care, Billing,Tech Support: 1-800-331-0500 or 611 from your wireless phone. hours: Mon.-Fri.7 a.m.-10 p.m., Sat.-Sun. 7 a.m.-10 p.m. 1  Welcome to ATT, if you are calling about phone numbers [number called from] press 1.2  Main menu to pay your bills or get other bill related options press 1, 3  for technical support or help with voice mail press 2, a.m.-10 p.m. 1  Welcome to ATT, if you are calling about phone numbers [number called from] press 1. 2  Main menu to pay your bills or get other bill related options press 1, 3  for technical support or help with voice mail press 2,