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Hello He i have to find developer mode in My Xperia xa1 plus. I should go to settings- about phone - Phone. I have to debugging the USB...but i'm not able To find It! How can i do?
Thanks
Solved! Go to Solution.
If you can not find Developer options / mode, go to About phone, tap 7 times on the Build number and Developer should be enabled.
If you can not find Developer options / mode, go to About phone, tap 7 times on the Build number and Developer should be enabled.
Hi @Ciaomassimo1960! 
To enable developer options on Android 8.0, go to Settings > System > About phone > tap Build number until the message "You are now a developer appears.", should be 7 taps. When it has been enabled you can find it in Settings > System > Developer options.
If you are on Android 7.0, it's under Settings > About phone > tap Build number until the message "You are now a developer appears". When it has been enable you can find it in Settings > Developer options.
I hope that helps! 
Thank you very much. I have done!