This is tested Samsung Qualcomm phones S20/S21/Note20 Hong Kong and Taiwan versions.
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Prerequisities: You need to download and install Google Phone app from Google Play market (Phone by Google-Caller ID & Spam Protection)
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Dialer app by default: After the first launch, the application will ask you to make it the default dialer, confirm by selecting its blue icon from the list of available ones. You can return the native dialer after service menu manipulations (Settings - Apps - 3 dots in the upper right corner - Default apps - Phone)
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Activation of the service menu: Go to the Google Phone and dial
*#*#27663368378#*#*
for Android 10 or*#*#276633683782#*#*
for Android 11. After pressing the last asterisk, the service menu will appear.