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How to Replace Your iPhone Signal Strength Bars With Numbers

These are instructions on how to replace the signal strength bars on your iPhone with a numerical representation of reception strength. (ie. numbers instead of bars).

Step One
Press to launch MobilePhone from your Springboard.

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Step Two
Tap the keyboard tab then dial *3001#12345#*.

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Step Three
Your iPhone will now launch Field Test. Notice your strength bars have been replaced with a number. This number is your reception strength measured in decibels. The closer to 0dB the stronger your signal.

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Step Four
Press and hold the Power button until the power slider appears.

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Step Five
Press and hold the Home button until the Field Test program is terminated. Notice the signal strength numbers still remain.

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To Switch Back to Bars
Dial *3001#12345#* again to enter Field Test mode.

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Press the signal strength at the top left of screen to toggle between numbers and bars. Then press the Home button to exit Field Test mode.

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