I've heard you can get a dual sim card. How do these work. To save me lugging two manky phones, could I trade in and get one decent one? Snag is both are pay as you go, one is Virgin [work one] the other is Vodaphone. I gather you toggle between the two diff numbers, what happens if you're on one number and you're txtd or called on the other. Lastly where do I find out more? ta