Cellphones are indispensable to moderns

Cellphones are indispensable to moderns. People cannot do many things correctly without them. First, cellphones can remember the phone number more quickly than a person. When we got troubles, we only need to press a few keys to call for help. Second, they are fast and can do lot of work at same time. Third, they are tiny, so people can control with only one hand. Cellphones not perfect, but very helpful.