@kevinmark - yes, wifi is much better for me as there's not much coverage of 3g up here in the forgotten corner of England. and therefore it's also much faster.

Also I'm on PAYG so it's £1 per day for 02 Data but because it's so slow I don't bother, I just hook onto the most convenient wifi signal when they are available and do without when they're not.

Unfortunately, some WiFis (like the Cloud) need you to log in every time you connect to them whilst others, (like the 02 shops) store the password for future reference.

However, because the phone picks up the first signal it finds, I often find that I've already connected to the Cloud which necessitates entering my email address and password, so I switch it to O2 which just connects. Job done.

If you go into Settings, General, Mobile Data and switch it off (you can leave Enable 3G and Data Roaming "ON" if you want), you can then go into Settings and WiFi and switch that on.

When you have done this it won't connect to the Mobile network and will not incur any charges or use any data allowance, but it will use WiFi wherever it finds it, which is a totally separate entity.

Admittedly, WiFi isn't available absolutely everywhere yet, but most pubs, cafes etc and town centres generally have something available to the public whether it be the Cloud or BT OpenZone or something else?

And of course, you'll be able to hook into your home wifi which should be available 24/7 whilst your 'at home' and this will not incur any extra charges either.

So you only really need to put your Mobile Data on when you're not close to (what is commonly referred to as) a WiFi Hotspot and you want to get some information urgently.

Hope this helps