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.
Some dairy items have impressive levels of two things many of us need more of: calcium and protein. I'm sorry to say that ice cream falls a bit short on these two nutrients, but low-fat milk, yogurt, cottage cheese, and reduced-fat cheese pack a protein and calcium punch in every serving.