SteveON: If you wanted to save money I wouldn't go with Vodafone in the first place :)
That is quite a general statement. Some examples would be nice.
I, myself, disagree with Vodafone not being cost effective. We've been a Vodafone customer for some time now, and the Vodafone family product works a treat for us. Being able to call/txt my parter and my business partner (plus he can call/txt his partner) for no cost is a massive saving to us. It also means I don't end up having to sleep on the couch at night as I'm always contactable by she who must be obeyed

My calling rates aren't unreasonable (our work VoIP with WxC is much cheaper but I digress) and the handful of times I've had to call 777 have been painless. We could swap to Telecom/2degrees, but we're more than happy with Vodafone - why change what ain't broke?
I did find my Vodem data slow, so I use a Telecom T-Stick for this. As a consumer, you really need to do your own research - one or more providers/plans will best suit you, and it's up to you as a clued up geek to figure out which is best
/my 2 cents.