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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

A mobile phone, cellular "cell" phone or hand phone is a mobile electronic device used to make mobile telephone calls across a wide geographic area, served by many public cells. By contrast, a cordless telephone is used only within the range of a single, private base station. A mobile phone can make and receive telephone calls to and from the public telephone network which includes other mobiles and fixed-line phones across the world...