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My contract with Vodafone is coming to an end. I have a Blackberry 2 Storm as part of my present contract and I'm happy enough with it. It tends to spend the working day as a tethered modem for my lappy at work as the MoD doesn't allow us to access 'interesting' websites on the firm's machines

I was considering an Iphone 4 but I'm not at all happy about shelling out well over £300 just for the phone with monthly contract charges on top of that.
So, what do people recommend as a good internet connected smartphone which will act as a tethered modem please?
If there isn't anything much better than my Blackberry, I'll just have the most expensive phone I can get for nowt with my new contract and sell it on, sticking with the Blackberry but I would really like a change

Thanks