Cheap PAYG in my work bag. OH knows I have one for back up, poor signal etc, as I travel around to different workplaces. Phoned her once, from a landline, asking her to make an urgent call to a client, as smartphone not getting a signal. She then suggested I buy a back up cheap mobile.
Always set up a smokescreen with a valid reason
Its always Off, locked with PIN and wiped clean of calls / texts every time. Why anyone would store numbers is beyond me...
I like the no camera phones reason too, adding that one to my reasons list, very plausable that..