I am not sure I recommend doing it, but this article shows how to put your iPhone into a diagnostic mode which will give you info about AT&T's network in your area:
http://gizmodo.com/gadgets/iphone/iphone-field-test-mode-lets-you-spy-on-the-att-network-277797.php
http://gizmodo.com/gadgets/iphone/iphone-field-test-mode-lets-you-spy-on-the-att-network-277797.php
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