至于SKYPE，则运营着最大的在线声音和视频通话网络。
Skype, for its part, operates the largest network for online voice and video calling.
这通常是看手机是否是兼容Wi - Fi，如果不是，要从网上获取通话网络是非常昂贵的。
It usually depends whether the phone is Wi-Fi compatible, because otherwise it is very expensive to get Internet off the phone network.
中国最大的手机运营商中国移动将于下周推出基于本国标准的第三代手机(3g)通话网络的试商用。
China mobile, the country's largest cellphone operator, will next week launch the pre-commercial service of third generation (3g) mobile phone telephony based on a home-grown standard.
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