Just for the record, here are screenshots of network errors and user interface glitches I collected during 2 years of an iPhone 3G use:

Safari page switcher on the iPhone, the front card drawn as a blank white sheet while the pages behind it render normally

Comment screen with an AZERTY keyboard whose keys have lost all styling, drawn as flat grey blocks on black

Orange World maintenance page in Safari apologising in French and English that the site is temporarily unavailable

Safari stuck loading a Hacker News item, the blank page showing only the text ERR_DNS_FAIL

Another Hacker News item failing in Safari, this time with ERR_CONNECT_FAIL on an untitled blank page

Home screen with the carrier name missing from the status bar, leaving the signal bars floating alone

Phone Favorites tab drawn as a list of completely empty rows, with unread badges still sitting on Recents and Voicemail