This might help someone, firstly u have to phone to get this deal as its still quite new.
The contract gives flexible credit of 300mins or 600 texts, or 150mins and 300 texts, or any other variation within the £60 value of credit they give you. Best to barter the best amount of minutes or texts u use, which ever more.
you can also choose 5 numbers you use most and those are only half the usual tariff cost.
It also includes unlimited 3g and wifi internet. but confirm this with the guy on the phone.