Why can't any of my apps except safari connect to the internet?

[iMore Question]

Yesterday I noticed that my iPhone 4 won't connect to internet on anything other than my safari app. Whether I'm on 3G or wifi, I can't send or receive iMessages, load my twitter feed, send or receive facebook messages, send or receive emails, download anything... I basically can't do anything which requires internet other than google things on safari. I've tried rebooting my phone twice and reseting my network settings, but nothing has worked. My phone is jailbroken so could it be a problem caused by that? How can I fix this? Everything was working perfectly until yesterday.

 

[pkcable]

You might want to check the iMore jailbreak section for some answers....

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