Since 1st May 2012, it has been reported by 'GkWmeer' that Wikipedia is down in Pakistan.
Are you experiencing the same problem?
GkWmeer is unsure whether it is blocked, banned or 'just' down in Pakitan, if you can confirm that would be wonderful.
You can still access wikipedia by accessing wikipedia's mobile version.
'en.m.wikipedia.org' All you've to do is add the letter 'm' in the middle of the regular wikipedia address :)