[m_hughes]

You can always call this number from your iPhone: 3001#12345#

and put your phone in field test mode

(http://gizmodo.com/gadgets/iphone/iphone-field-test-mode-let...)

[rryyan]

Unfortunately this capability has been removed from iOS4: http://forums.macrumors.com/showthread.php?t=942533. Just confirmed it on my iPhone 4.