Cellular phones use both voice and data communication. Until recently voice has been more common for obvious reasons, but data has surpassed it due to the large number of applications that our phones now use.

Landline phones also use both as your voice is sent through the line like a data packet. This can have an effect on the quality depending on your phone type as it may drop these, leading to issues with call quality.

Texting and SMS are both forms of data transfer, not using voice at all. They operate by sending small packets of data usually restricted to a certain number of characters to other devices.

Fax machines use data transfer, not using voice. Using an analogue signal they digitize work as soon as they receive it.

Pagers utilize data to receive messages or notices. They respond by usually giving off a tone or vibrating to get the user’s attention, and then displaying a message.

VOIP phones use both voice and data to operate. The voice is turned into a data packet and sent down the line through the network or internet. This allows it to call normal phones, as well as other computers.

Skype and Facetime use both voice and data in much the same way as a VOIP phone, except they also pack up video footage and send it alongside the audio. These can contact other devices capable of running the program, and must have internet connection to do so.