2008 Sichuan earthquake:

China Mobile had more than 2,300 base stations suspended due to power disruption or severe telecommunication traffic congestion. Half of the wireless communications were lost in the Sichuan province. China Unicom's service in Wenchuan and four nearby counties was cut off, with more than 700 towers suspended.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". How many of China Unicom's towers were cut?
700