Now you come to mention it ... yes I was taught this, maybe in 1989, and have never used it[#] and have forgotten it. So yes, a reminder would be helpful.
I have, however, remembered some stuff about squawking 7600 and flying past the tower waggling wings and looking for a green light. (I've usually got a switched-off phone with me; I'm not sure I would bother to turn it on and call anyone - perhaps if I had a passenger with me to look up the phone number in Pooleys I might.)
And, probably most useful of all, I most certainly remember that the aeroplane doesn't know that the radio isn't working, and will keep flying perfectly happily.
[#] I once got "station calling xxx, carrier wave only" when calling for taxy, and that was enough for me to diagnose and fix the problem (headset plugged into wrong sockets).