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The way I see it is I pay £30 pcm for my mobile contract. That should include a reasonable amount of data allowance and voice minutes, sms and what not.
I pay a lot less than that for my landline and broadband connection. I am sure it costs a lot more for mobile networking infrastructure, but you can't tell me they don't make shit loads of cash as it is so further price hikes just enhance their reputations as rip off merchants.