Bit of a newbie on this as I've only ever used a mobile phone to make calls so bear with me!

I have just started admin on a website and often need to update it several times a day. A dongle-powered laptop with internet is impractical for me to carry around so I'd like to be able to update my website from a phone.

The iPhone looked like fitting the bill but as I understand it only connects via a WiFi hotspot (may be wrong though?). Most of my time I'd need to connect on the train, so would need the internet to be 'browsable' wherever there's a mobile signal (apologies for the non-teccy approach to this!!).

I've also looked at 3's X-series and the Blackberry Pearl but not sure if they'd fit the bill. Many of these services seem to struggle with Javascript from what I've read and my website's admin setup uses a lot of javascript.

Any ideas? Thanks!