In the Austrian city of Full-am-Zee, researchers have unearthed something very similar to 2800-year-old Mesopotamian clay cell phone (judging by the quality of photos that the researchers themselves are slightly newer models).
According to published on a very reputable website misteriousuniverse.org the information is not known exactly what were looking for archaeologists, when they ran this like the Nokia handset the artifact, but their original purpose was definitely not Sumerian clay mobiles.
How phone with cuneiform inscriptions was in modern Austria, you ask? Eventually, Mesopotamia was never extended North or West of the territory of modern Turkey. The authors of a news suggest that aliens created the Sumerian civilization, but were forced to hide the artifact after the failed attempt to promote provider.
Unfortunately, modern science is still unknown a technology that allows mobile phones clay to work with.
According to the materials of Popular Mechanics