Question

excessive use of mobile phones lowest our social life in favour and against the topic

Answer 1

favour....
helps in studies..
connect to people worldwide...
helps in navigation...
helps to click pictures ...

Against...
wastes a lot of previous time...
excess and addictive use of social media..
excess playing games which damages our eyes...
bad information on internet.....

Hope it helps...

Answer 2

IN FAVOUR-

A person is in an unhealthy phase of obsessive and constant cell phone use. This may be caused by the newness of the device or by an emotional problem that makes them use the cell phone to isolate from others who surround them. Or, it might be that the increasing use of the cell phone by everyone else causes the person to get one of their own.
More often than not; people use cellphones to pull themselves away from a crowd or ring themselves to get out of an uneasy situation/conversation where they have to confront themselves emotionally. Text has no tone; breaking up by thumb-text is so much easier than a face-to-face or phone conversation where you hear the crying and wailing. Real social interaction which forces you to develop an emotional conscience is thus inhibited. 

AGAINST-

Sometimes emotional breakdowns on the phone or in person can be embarrassing and lead to no growth. To allow the other person the dignity and composure of not having to visibly and audibly break down; is the most decent and civil way to do it. 
The most social kids in school today are constantly talking to their friends on their i-phones or androids or other cellphone varieties:
Thumb-Texting is the current most popular medium for planning parties or asking people out on dates etc. Since a cellphone is almost always on your person the issue of using cells is not that it inhibits an active social life but that it creates an overactive social life; making it near impossible or do or think about anything else.