Cell Parts. Your body is made of about 10 trillion cells. The largest human cells are about the diameter of a human hair, but most human cells are smaller -- perhaps one-tenth of the diameter of a human hair.Run your fingers through your hair now and look at a single strand. bacteria is a single, self-contained, living cell. An Escherichia coli bacteria (or E. coli bacteria) is typical -- it is about one-hundredth the size of a human cell (maybe a micron long and one-tenth of a micron wide), so it is invisible without a microscope.
A cellular phone that uses the Global System for Mobile (GSM) network and can access multiple cellular phone service provider networks is called an unlocked GSM phone. A locked cell phone is sold by the cell phone service provider and cannot be used with any other provider.
An unlocked cell phone is a mobile phone that can be readily used on any GSM network of the owner's choosing without having to commit to a carrier plan of any kind. This means that the owner can slide in a SIM card from any wireless carrier in his or her region to start making calls, surfing the Internet, and benefiting from any of the services available on that carrier's network for its customers.