Nope. If I get a phone I feel obliged to carry with me when I go out then people will bleddy call me. Stuff that. My rate is about £1 per year which beats all the tariffs above.
Sensible I think you need to revisit both the purpose of phones generally (i.e. that people can call you) and mobility (i.e. that you can carry it with you).
I'm just thinking of getting a new one... some great deals out there on monthly contract at the moment.