Your far better off without a cellular telephone altogether. The damned things have been shown to provoke brain tumors on the side of the brain closest to the ear to which it had been many times held.
I don't own one, and I have no interest to be bugged further by telephones. The one on the wall here at home and the one at work are PLENTY for me. I've lived happily for fifty-six years without that nuisance, and I don't wanna' new headache (in more than one way).