So - in this thread, it appears SF is having major issues in Karachi as far as customer service is concerned, but not in the other cities?
Service-wise, I know a few Karachiites who are contended with SF. I don't have it (no coverage where I live) but I've been wanting to get rid of PTCL (I have fiber) because of their billing/customer support/other ticks/crap TV.
Trouble is, Pakistan Package is the reason people are hooked onto PTCL - it just doesn't make sense to use another landline service given most connections belong to PTCL.