Buongiorno Roberto
GSM possibilities in Pakistan are limited (status Sep2007) and depend quite a bit on your provider and his roaming contracts (Voda was a little better then O2 ..if I remember right). Also field strength is quite ok just at the BIG cities (Islamabad/Pindi), along the main roads its so-so or bad, but on the countryside there is no coverage  … especially at the northern parts of Pakistan and the KKH (except on the top of the Kunjerap pass, there you can dial in to a Chinese network  !
Maybe coverage is better now, but I presume not. Hope this info helps you along;… or just enjoy your trip to Paki-land without using any communication network
Greets
Jörn
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