Unicom Guomai Communications CO.,LTD.engages in the field of trunking PAMR. It takes MOTOROLA SMARTNETII+ as its anolog system, which owns three sites cover the most area of Shanghai.The usual coverage area is based on the sites, with a radius of 25 KM (handset) or 45KM (mobile phone). In 2001, Unicom Guomai invested in Motorola’s iDEN system, This digital wireless trunking system is to meet the increasing demands of the market. There are 40 sites in Shanghai, and its coverage is almost 90% area of Shanghai.

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