Thanks to all the participants for creating this thread and providing valuable input regarding the performance of 3G/4G networks at different locations.
I've been using telenor 3G for quite some time and was getting on an average 1.5Mbps download speed. Although it was enough to remain online while roaming around but i was unhappy about the download speed. Then i switched to Mobilink 3G and download speed reached 5Mbps. It was a pretty decent speed for my daily tasks including heavy email attachments. But there was one issue that put me off and it was the vast difference between Mobilink data counter and my cell phone data counter. Mobilink was showing 60% more usage than my cell phone (on a 2GB package) which could be due to some minimum data block size but i am not sure.
Long story short, after reading this thread i decided to switch to Zong 3G as people were posting pretty good results here and now i am a happy camper
Usually i get download speed of 4.5Mbps and occasionally it goes above 10Mbps. Fortunately and to my surprise, data counter of Zong and my cell phone are almost in sync which is a great relief for me