Cellphones by Yenny Pan https://padlet.com/yennypanz09/o8bgbxa8u767dsz9 en-us 2023-05-10 16:07:44 UTC 2025-12-03 09:45:33 UTC hello@padlet.com yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2585780769 2023-05-10 16:23:39 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2585780769 A mobile telephone (cell phone, etc.) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as distinguished from a location telephone landline (landline phone). yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2585784337 2023-05-10 16:26:02 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2585784337 In 1917, Finnish inventor Eric Tigerstedt filed a patent for a "folding pocket telephone with a very thin carbon microphone." The early predecessors of cell phones included analog radio communications from ships and trains. yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588590192 2023-05-12 11:46:53 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588590192 The first portable cellular mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a phone that weighed 2 kilograms (4.4 lb). yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588714443 2023-05-12 13:36:02 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588714443 yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588733857 2023-05-12 13:49:12 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588733857 smart phone yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588745405 2023-05-12 13:56:19 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588745405 basic phone yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588745868 2023-05-12 13:56:43 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588745868 Neck Pain. Increased stress. Headaches. Insomnia. yennypanz09 https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588751535 2023-05-12 14:00:07 UTC https://padlet.com/yennypanz09/o8bgbxa8u767dsz9/wish/2588751535