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iPhone Field Test Mode

Apple has decided to add Field Test mode back in iOS 4.1.  Field Test mode allows you to get a numerical figure for your antenna strength rather than the traditional bar measure. To get to Field Mode, Dial #3001*12345#* and hit send to activate.  Pressing Home will exit you from the Field Test mode.

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Figure 1. Shows –72 Antenna Signal Strength

Signal strength, as showed in Figure 1 upper left corner, is a number ranging from roughly -50 to -105 (your phone may show as a positive number). Closer to zero means a better signal, i.e. -50 (roughly full signal) is better than -105 (roughly no signal.)

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