From the article:
Ten mobile phone masts were attacked in recent weeks, the latest on Tuesday night, the Afghan government says. Last month the Taleban threatened the companies, alleging that the networks were being used by Afghan and Nato troops to target them. Mobile phones are the only form of communication for many Afghans. Since a threat by the Taleban last month to target the towers unless the phone companies switched off their signals at night, 10 such facilities have been attacked, six of them completely destroyed. Afghanistan has four mobile phone companies, all privately owned, and they now appear to have begun complying."