With Three, a £10 top up gives you 600 free texts everytime you top up (if you top up online) 150mb internet, and then all the other extras including unlimited 3-to-3 calls, and it all lasts for 3 months, instead of 1 month.
i think that will benefit you a lot more than with Orange.
you can get your free sim here:
https://www.three.co.uk/Pay_As_You_G...der_a_free_SIM