Thanx All
Your rapid response is really very much appreciated.
Just FYI, I'm calling from a landline in Italy and I have just found out that, as I suspected, I don't have to dial the 1 immediately preceeding the 519.
The reason I couldn't reach her before, I've just discovered, is that I hear the phone ringing 6 times before her mobile phone actually starts to ring. Then I should have waited another six rings for her to realise that it's her phone that's ringing not somebody else's, and another six rings for her to discover that it's not in her pocket. It takes another 6 rings for her to put down her slice of pizza and start rummaging through her voluminous handbag, and yet another 6 rings for her to fish it out of her bag and press the answer button.
That's 30 rings before she answers and I just thought I wasn't connecting because I had dialled incorrectly.
WOMEN! Can't live with 'em and can't live without 'em!!