Isla attempts to try her luck, she drives all the way from her husband's estate to Cameron's estate. She arrives in the evening when she is sure that he will be back from work.
Then the cell phone rings. Ava is massaging Cameron at this time, to ease the stress-filled day he had. She didn't go to work with him because she still needed time to recover.
Each time the cell phone rings, it's always from the security at the gate. It has a reserved purpose in such a way that each time it rings, it's obvious that there is a visitor at the gate. Cameron devised this means soon after he came to live here such that no one would take him by surprise.
An update like this would make him pause what he was doing and check the CCTV in his room overlooking the gate to see who it is that is intending to
