CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are shorthand for the two major radio systems used in cell phones. Both acronyms tend to group together a bunch of technologies run by the same entities. In this story, I'll try to explain who uses which technology and what the real differences are.
Dairy. Dairy products provide nutrients that are critical for bone health, including calcium, potassium and vitamin D. Dairy is also a source of protein. The benefit dairy provides for bones makes consumption especially critical for growing children, whose bone mass is developing.
1 Many dairy products, such as butter, cheese, and milk have vitamin D. Fortified cereals and fish are also good sources of this vitamin.  For adults under 70 years of age, 600 international units of vitamin D per day is sufficient. Adults over 70 should consume 800 international units.