Rocco was "pushed over the edge" by his strict mother's belief the device was interfering with his homework, so following a row over its usage, he quit life on the road with her to go to London to stay with his father and stepmother Jacqui Ainsley a month ago, reported Daily Mirror.
A source said, "Madonna is quite firm with Rocco and she took his phone from him when it interfered with his studies.
"She is stricter than Guy and Rocco doesn't like it. When she took the phone away, it pushed him over the edge."