Located the phone. Appears to have been thrown from a car on the M50 near Clondalkin. I went there to try find it. By the time I got there the battery had gone flat and I walked up the glass but couldn't see it.
I suspect it's in the bushes, but they are really dense. I couldn't find it. Ah well that's that.
You are a good guy Tony. At least she can wipe it.