13 Secret Codes That Unlock Hidden Features on Your Phone

The USSD protocol allows you to access hidden features you didn't know about right from your smartphone's dialer. But there is some trickiness you'll need to know about.
The USSD protocol allows you to access hidden features you didn't know about right from your smartphone's dialer. But there is some trickiness you'll need to know about.

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13 Secret Codes That Unlock Hidden Features on Your Phone

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