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Re:Antenna designer writes about the iPhone 4 by m_hughes on Friday June 25, 2010 @08:58AM (#1460601)
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...)

Re:Antenna designer writes about the iPhone 4 by rryyan on Friday June 25, 2010 @12:18PM (#1461178)
Unfortunately this capability has been removed from iOS4: http://forums.macrumors.com/showthread.php?t=942533. Just confirmed it on my iPhone 4.