Came across this site on ProPakistani that you can send and receive twitter alerts via mobi2weet.com. I registered, and although there is a small lag, it's not major.
They've got Ufone and Mobilink access numbers right now, but I think they'll add more later. Rest assured, it works for all networks in Pakistan (since it's a common cellphone number that you interact with).
Oh - and if you have a gazillion followers, you can enable selective updates too. Check their site for registration and help.
Thought you'd all like to know. So far, I don't know how they'll monetize.