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Field Test is Back in iOS 4.1

Apple has re-introduced field test mode in iOS 4.1, which will allow you to quickly check the quality of your cellular signal by simply dialing: *3001#12345#* and pressing Call on your iPhone.

The signal bars on your iPhone will be replaced by a number. The higher the negative number gets the worse your signal is. For example, -100 is worse than -79.  If you tap on the displayed number the display toggles between displaying the number and the normal signal bars.

Try the test for yourself and during the test hold your iPhone 4, the wrong way, by connecting the two metal bands on the lower left corner with your finger or hand over the black plastic strip. You’ll see the phone’s signal quality drop rather drastically due to the iPhone 4 death grip.

Testing my iPhone 4 on a bad weather day in Thailand I have -65 as my signal strength, with or without the “death grip”.