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NoUSSD

USSD firewall
Many Android phones have a security flaw where they will automatically dial any
telephone number touched on a web page. USSD codes are numbers that can provide
system info such as the IMEI number and possibly even do a factory reset. NoUSSD
will intercept all USSD codes and give you the choice to not dial them. Regular
phone numbers will be sent automatically to your favorite dialer.

Packages

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid