Find Your iPhone's Signal Strength Using the Hidden Field Test Mode
A co-worker let me take a look at his Cell Ranger Port yesterday. This device somehow amplifies GSM and CDMA radio signals for nearby cellphones. While reading a review of it in TestFreaks Blog…
…I noticed they provided the keypad sequence to place an iPhone 3G in what is called Field Test Mode. This is a hidden diagnostic tool that can, if you know how to read and interpret its output, can tell you a lot about the radio signal quality your phone sees.
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