3G in Karachi:
From the top:
Mobilink
Zong
Ufone
Mobilink and ufone had stable signals. Zong dropped to 3 or 4 bars and even dropped once to edge in a 5 minute period.
Highest Building Penetration (high speed 3g indoors, max signals): Mobilink, Ufone
Highest Speeds Indoors: Mobilink, Ufone, Zong
Highest Speeds Outdoors: Mobilink, Zong (didnt test 4G yet)
Best Packages: Mobilink, Zong
When 3G started, I had Telenor. It was shitty!!! bad bad coverage in karachi. when it does work its pretty damn fast. but i favour reliability any day because of my work.
So im using Ufone. And i'm pretty happy. decent packages. 1GB per month for Rs 200, but their speeds around 2Mbps
However, I'm strongly considering moving to Mobilink or Zong. Higher speeds, much better packages and the same or higher reliability from Mobilink
Need to test Zong 4g, and 3g more. But mobilink is a clear winner right now