April 3, 1973 marked the creation of the first mobile phone, when wireless communication was used for the first time. Martin Cooper, who was a representative of the company "Motorola", is considered the founder of the mobile phone. Most mobile phones have their own unique number, the so-called IMEI, international representative of mobile devices. IMEI is designated by the mobile phone manufacturer and consists of 15 characters. it is written on an immutable part of the phone's firmware.
about mobile phone
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