truly the first mobile telephone which could connect to the telephone network without the assistance of a mobile operator and could be carried about by the user. Accessories In certain markets, a brass swivel antenna was one of the aftermarket accessories then available. Motorola also offered a one-hour desktop charger, though the battery could get quite hot while charging at this accelerated rate. In some cases, this could cause major problems with the battery, occasionally short circuiting it and rendering it unusable. Also, charging the battery at a high enough rate to substantially raise its temperature will cause the battery to wear at an accelerated rate, reducing the number of charge-discharge cycles that can be performed before the battery will need to be replaced. (However, considering the high cost of the DynaTAC, the cost of battery replacement would not typically be a concern to DynaTAC owners.) Available, too, was a snug-fitting zippered leather case which covered the entire body of the phone and had a clear plastic front to make the user interface accessible. It featured a sturdy spring-steel belt clip and a small cutaway at the top to allow the antenna to protrude. Charging could still be performed with the cover on, but change of battery required its removal. Dynatac relates to US phones used on the Dynatac system in the US, not phones in use in the UK. See also AMPS References DynaTAC Mobile phones introduced in 1984 Computer-related introductions in 1984