IPhone 4 extremely slow using Safari, network timeout

Checking on this issue for a friend... He says his network times out when trying to retrieve email from Hotmail account, as well as extremely slow loading Facebook, etc. I had him disconnect from the wireless network he is using to see if it's that. If so, any thoughts on why wireless activity would be so slow? I had him check how much space he's used on his iPhone and he tells me he's only used 2.6 GB (his phone is 16 GB).

Is he using  an ATT or VZW iPhone..also, is he using wi-fi or the cellular data network?  If wi-fi I wonder if another non mobile device, say a laptop or something, connected to the same access point, has the same slow issues.  This article has some additional details about troubleshooting wi-fi
http://support.apple.com/kb/TS1398

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