o Landline phones: Landline phones use both voice, and data networks. Originally it was just voice, then "the data network" began with dial-up modems, and fax machines.
o SMS/ Text Messaging: Text Messaging is a data network. Cell phones pave the pathway for SMS messages. When a friend sends you an SMS message, the message flows through the SMSC, then to the tower, and the tower sends the message to your phone as a little packet of data on the control channel. Cell phone calls are different, they use radio frequencies instead.
o Fax Machines: Fax machines are in a data network. Fax machines transmit mainly through landline phones. Recently, they also send through Voice Over Internet Protocol (VOIP.)
o Pagers: Pagers are data signals that receive similar to cell phones, but with no voice radio frequencies.
o VOIP (Voice Over IP) phones: VOIP is data. It is sort of like an analog to digital translator. The data goes from voice over an Internet protocol .
o Skype: Facetime Skype is a proprietary Voice Over IP and software application, therefore, it is an application used on a data network.
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