Maybe so, time will tell.
I have an idea that when the coast to coast CCTV Road Traffic system kicks in and penalty points begin to tot up like a convenience store register as they inevitably will for a lot of our eager beaver drivers, that we will see some robust defences because just like the Drunk Dvg situation, being banned would pose very big difficulties for a lot of our long distance commuters. There will be an awful lot more people heading for 'driving ban' land and very quickly too when the cameras get going, lots of rude awakenings there to be sure.
A lot of things, imo, in Garda evidence may be open to challenge, e.g. lighting conditions at the time, line of vision, distance at the time of sighting, was the vehicle moving ?, was it raining ? how credible would it be that a Guard could swear he/she saw a small handheld phone (palm of the hand?) in a moving vehicle's interior, there's lots to be considered there and I feel there will be challenges aplenty. I wouldn't be at all surprised to see a small industry spring up down the line around lawyers skilled in the minutiae of Road Traffic law in response to phone use prosecutions.
I'm just interested in how the law is working or not and inviting people to relate their experiences thats all.