Mobile phone commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile phone subscriptions grew to over seven billion—enough to provide one for every person on Earth. In first quarter of 2016, the top smartphone developers worldwide were Samsung, Apple, and Huawei, with smartphone sales represented 78 percent of total mobile phone sales. For feature phones (or "dumbphones") , the largest were Samsung, Nokia, and Alcatel. A handheld mobile radio telephone service was envisioned in the early stages of radio engineering. In 1917, Finnish inventor Eric Tigerstedt filed a patent for a "pocket-size folding telephone with a very thin carbon microphone".
Postpaid mobile phone use of mobile services and, as a consequence, unlimited credit. This service is better for people with a secured income. Postpaid service mobile phone typically requires two essential components in order to make the 'post-usage' model viable: The bill itself is an important component of the services which acts as an ambassador of the service provider and at times as an evidence of the service itself. The bill needs to be readable, comprehensible as well as aesthetically attractive for the subscriber to be interested enough to see details other than the bill amount. The United States is an example of