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.
For those who have little use for cell phones, AT&T still offers pay as you go plans: â 1 $2/day on days used with unlimited talk and text and pay per use data at $0.01/5KB.  Pay as you go with $0.10/minute, $0.20/text message (or package), and $0.01/KB data.