What's the best mobile network to be on in the UK?

I've got a Blackberry at the moment and I'm paying £15 a month for 500 texts, unlimited internet and BBM. (Not on contract)
But I'm thinking of getting an iPhone 5 soon on contract for a year maybe?
Anyone know what the best network would be?
I'm not bothered so much about call time, but I text a lot and always use the internet.

The best mobile network to be in the UK is the t-mobile.enjoy!

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