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Field Test Modes

Mobile Phone field Test Modes

NOTE: Signal strength, measured in decibels (dB), is expressed as a negative number. On certain phones, the number may show as positive in test mode. In such cases, convert it to negative. For example, 60 dB is actually -60 dB. The lower the number, the stronger the signal. Thus, -60 dB is a stronger signal than -75 dB.

Apple iPhone: Please Note: iPhone models that have version 4 software (i.e iPhone 4 or any iPhone that has been upgraded to Version 4 software) may not support test mode. use the following code: In phone mode dial *3001#12345#* then press CALL. The Field Test Screen will appear. Your bars at the top of the screen are now replaced by a –dBm number. * There are many apps on iPhone for measuring signal strengths and identifying mast locations.
iPhone Signal Strength Reading
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Blackberry:  From the main menu highlight and select OPTIONS and then select STATUS from the next menu. The top line is the signal strength (i.e. -78 dBm). Note: GSM and iDEN models also have this feature.

Alternate Method: Hold down ALT and push N M L L and your bars will be replaced with a –dBm reading. Repeat the same to return to bars.
Blackberry Signal Strength Reading
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Android: Downoad Signal Strength Widget *There are many different apps on Android for measuring signal strengths and identifying mast locations.
Android Widget Screenshot
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