...ok I hope to be getting a new phone soonish, but the phone I think I want is on Vodafone. Trouble is I am on O2 right now, and so is the rest of my family, and to get a different network would make calls more expensive. I heard that you can swap networks some way. I tried swapping a sim in my friends phone, but as expected, came up with "Wrong Sim Detected". Any idea how? Thanks.