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tel://NUMBER will pop up a dialog asking if you wish to make a cellphone call to NUMBER using the baseband.
facetime://CONTACT will pop up a dialog asking if you wish to make a video call to CONTACT using Apple's Facetime over Wi-Fi.
Mode: Field Test You will then be taken to a page providing many current information detailing your cell connection.
Note that when you are in this mode, the signal strength bar on the top-left corner becomes a negative number.
The closer this number is to 0, the stronger the cell signal (or the closer you are to a tower).