移动电话市场是当前增长最快的通信市场之一，其用户增长率和市场潜力远远超过了固定电话，移动性是２１世纪通信的重要特征。专家们指出，充满活力的移动通信领域呈现出三个发展趋势：从单一的话音服务的到能为用户提供多种增值服务；向数据通信领域迈进；向第三代移动通... The mobile phone market is currently one of the fastest growing communications markets with subscriber growth and market potential far surpassing fixed-line telephony. Mobility is an important feature of communications in the 21st century. Experts point out that the dynamic mobile communications field presents three trends: from a single voice service to provide users with a variety of value-added services; to the field of data communications; to the third generation of mobile ...