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Apple has a hidden feature to all iPhones that tests the quality of your cell phone‘s single strength.
To get it, do the following:
1. Go in to the telephone section.
2. Bring up the dial pad.
3. Dial: *3001#12345#*
4. Press the “Call” Button.
The normal single bar will be replaced by a negative number. The higher the number, the worse the single is. For example, a -100 is worse then a -86. If you tap the number, you can toggle between the number and the standard single bars.
You will also get a table view full of optional commands. To keep this article simple, I won’t go into what these options are – that’s for you to go exploring 🙂
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