How can I stop the phone's camera from being dragged when the player is dragging handles? (e.g. ArcHandles, etc.)

The title says everything.
Btw, that problem doesnt occur in computer. Only on my phone. I’m not sure about Tablet PCs.

In your LocalScript (assuming you already have the handles in the handles variable:

local camera = workspace.CurrentCamera

handles.MouseButton1Down:Connect(function()
    camera.CameraType = Enum.CameraType.Scriptable
end)

handles.MouseButton1Up:Connect(function()
    camera.CameraType = Enum.CameraType.Custom
end)

I haven’t worked with cameras for a while, but this is what I’d try first.