Signed up with Virgin last week, excellent 3G signal compared to O2 which i was on before, brilliant tethering with iphone. Unlimited, calls texts and data. PS i dont work for Virgin, just thought id share the great deal.. http://store.virginmedia.com/virgin-media-mobile/sim-only/pay-monthly.html
Same as what i'm on with O2, but the 3G is terrible. Are they doing micro sim now then, they weren't last time I looked (you had to cut it, which is a bit silly)