Views differ considerably when it comes to the issue that whether a telephone plays a more effective role than television or not.
"or not " is unnecessary here~
while others think that a television can help them spend the time.
I think the rear part of this sentence can be revised" they is able to kill time more effeciently as watching TV
For example, when your work place needs to find you, they will connect with you by the phone, not by a television
This sentence is not appropriate~First, work place can't find people, just people find people,like your boss. Second "they" should be revised to be "it "
when the users themselves learn how to control their time and not to use it continuously, it won't be a problem at all
"learn how to limit their time" is better~
which is that a phone is more effective that television in people's life
the second "that" are supposed to be "than",right? I believe it's a slip of the pen~
Most importantly, I wanna say that telephone is not completely equal to cell phone as you said at the begining of this passage, and I think you have to build some connection between these two things by a sentence, such as " Nowadays cell phone is a primary type of telephone." In this way the logic connection would be more clear~
The discussion above is just my point of view, may not be totally right~