I bought two Life Mobile sim recently and cannot recommend them enough. The second sim was faulty when Life Mobile tried to activate it but they sent out a new one.
I ported my number from EE to one of the sim and it took place without a hiccup within 2 working days.
Such great value sim plans that I would definately recommend these guys if you are looking for a sim only plan.
I was persuaded by EE to renew another sim contract instead of going to Life Mobile on that one as well as I thought that the 4G offered by EE was going to be superior and I was concerned that the 3G signal for data offered by Life Mobile was going to be poor in comparison.
However, testing both sims at home (Surrey), there is no difference noted in speed between EE 4G and Life Mobile 3G. Both are reasonably fast so I was pleasantly surprised with Life 3G speed.
Thought I would post this in case it helps someone who wants a cheap, good value sim that runs on the EE network.