I have to say that I find cyclists in the UK, and especially in London, extraodinarily aggressive. And I should add that I do not own a motor car and haven't done for something like fifteen years. On the contrary, I own a bike, and I love using it.
BUT: if all the details of this are correct, it is my considered opinion that the woman in question should be given a heavy fine, and possibly a suspended sentence. Anybody stepping off a kerb using a mobile phone and onto a road that is busy with traffic is totally out of order. As is anyone using one at the wheel. There is no conceivable conversation that anybody could be having that warrants it. Just possibly if someone were telling you that you mother were on her death bed, and you had to come at once. And even then, it's not easy to understand why you would want to prolong the conversation in the street without stopping for a few seconds, and then ending the call.