“pager”, “beeper”, “cellular phone”, “cell phone”, “mobile phone”分别什么意思?

“pager”, “beeper”, “cellular phone”, “cell phone”, “mobile phone”分别什么意思?
Do you sometimes use them?
How do they compare with the standard telephone?
这两句什么意思?怎么回答呀?
“pager”与“beeper”, “cell phone”与“mobile phone”
都是呼机，都是手机，那他们之间有什么区别啊？