Mobile phones are the greatest inventions of all times. Using these cell phones now can easily communicate with our friend and family members. Mobile phone is one of the technology which plays a vital role in our life. Now a days internet in mobile phones are so common with which we can connect to each other anywhere and anytime. These mobiles contains built-in apps like Facebook, Skype , what Sapp , viber. These VOIP technologies have reduced the cost of a call to almost zero
