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.
Whereas a locked cell phone will only accept SIM cards from its current provider, an unlocked cell phone will accept a SIM card from any service provider. (This is very useful if you want to use your phone abroad, for example.) To identify an unlocked cell phone, follow these steps.. Power down your cell phone, remove the battery cover and battery, then look for the SIM card. 1  If you cannot find a SIM card in the back, look for one in the side or top of the phone.