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.
Besides the upfornt cost of the iPhone 4, youâll need to sign a two-year agreement with AT&T and consider the following: 1  AT&T Voice Plan: AT&Tâs voice plans start at $39.99 for 450 anytime minutes and range up to $119.99 per month for unlimited family plans with two lines of service.reakdown of iPhone 4 Costs. There are a lot of costs involved in picking up the new iPhone 4. New AT&T subscribers and qualifying AT&T customers will be able to buy the iPhone 4 fort $199 (16GB) or $299 (32GB), which is in line with the original pricing of the iPhone 3GS.