I have forgotten the 6 digit password to an old iPhone 6 I have and I need to activate it for my mother

Hi TomYearsley,

It seems you're having trouble with a forgotten passcode and we can help.

You'll need to connect to a computer while your iPhone is on the restore screen.

Follow the steps here:

If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

Let us know if that helps. If you get hung up during the restore process, tell us exactly at which point you're having trouble and we can help.

Thanks for using the Apple Support Communities.