Ironically, as mobile operators race to upgrade their 3G networks to offer wider coverage and higher transmission speeds, they also increase their vulnerability to VoIP.

• 讽刺的是，现在的移动运营商却在为升级他们的3G网络扩大覆盖面和提高传输速度上彼此竞争，这也正使得他们的弱点越来越多的暴露给网络语音技术。