Zong also known as China Mobile Pakistan is a largest Pakistani mobile network which was founded in 2008, The headquarter of Zong is located in Islamabad. Zong is offering voice and internet service for both postpaid and prepaid users with 2G, 3G, and 4G network. Zong is the first 4G provider in Pakistan and their Wingle and Dongle usb device has largest number of Users in Pakistan. They are offering some nice internet packages to Pakistani internet users. You can visit their website for further information.
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One more thing that bugged me about Zong internet was the constant verification popups that made me select store fronts or bodies of water, that was really annoying, luckily that did not last forever and was fixed after couple of weeks. Overall not very happy, but if you need speed and unlimited bandwidth, you must pay 4000 to 5000 a month. Good luck.