Eeerm.. is not yours more expensive for 12 months ? If you multipy yours by 2, then more than mine, ok you get more internet, but less calls...
I want a phone with some internet access... I have a computer at home for most stuff. 750 mins of calls is very poor in comparison.
You pay a small premium to have just a 12 month contract. As you are out of it and can shop around after that period. In a 24 month case you're stuck - but they still only need to cover one phone, one customer support load of calls, one bill per month, one direct debit per month etc etc etc - so they do still profit moreso than a 12 month contract, they just charge you a bit less to counter balance that and keep you with them for twice the period.