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Lovely sketch wasn't it?!! Lol - but yes, my grandmother can hear most of the conversation over the phone. It must be certain pitches that she can't deal with very well. Mind you, her last conversation with my sister went something like:
"Are you keeping alright?" "Fight? What fight?" "No - I just wanted to ask...." "Don't you swear at ME!"
Bless her - that was a joke, but seriously, it's just the low-level ringing bit which she has the most difficulty with, so again - thanks all, I'll look into things for her.