It is better if you have at least one sentence to support the idea that the mobile phone is one of the most widely used technologies.
The mobile phone will certainly bring about a lot of advantages.
"Bring about" is used in the speech rather than in academic writing.
hence we can contact easily with our friends and our relative
When the word, "contact", is used as a verb, you shoud use the adverb immediately or directly.
hence it is easy to directly contact with our friends and relative
The word, "can", is used three times in your paragraph. Perhaps, this shows you lack ability to express that verb under the eyes of examiners.