I was browsing internet on ufone 3g and observed a strange behaviour. A popup ad appeared whenever I clicked on a site, and it happened on all sites.
This only happened on Ufone, and whenever I used any other network, sites worked fine.
I contacted ufone, and they said it is not a network or 3G issue, and sites display ads.
ufone network was sending a malicious js containing ad code instead of actual js file from google.
Below is screenshot of code of that malicious file which load pop up ads on pages without knowledge of website owner and end user.
This is a serious security issue and ufone should take strict action against the person responsible for this.
I am using ufone 3g in Khuzdar where I encountered this problem.
If anyone else is having same problem share your experience below.