b)the most
interesting
Объяснение:
Communication tool to explain that you need a mobile phone. First, the mobile phone, easily portable, with wide coverage area, using a wireless phone system is a communication and multimedia devices. Services provided by mobile phone after the phone model and service providers to change according to the most widely used, but they, voice calls and short message service. In addition to voice and text communication with video calls, picture messaging, video games, internet, data transfer and telephone banking services for used. Moreover Internet is used. By using online accounts such as Paypal, sms via the purchase of goods and services is used for payment of fees. To specify the antenna elements and has the touch screen and keys. First mobile phone signals in a better antenna is needed to catch up. The first models are typically when an external antenna, the antenna device, instead of advanced model of the phone's antenna to the various devices then advanced mobile phone models.
b) the most interesting