I wonder if anyone can answer this question. I live in the US but I'm English so travel back not infrequently but sometimes there is a year or more gap. I've purchased PAYG sims before but the one problem I haven't to date been able to solve is keeping the sim active when I'm out of the UK, so I lose my number and have to start all over again. It occurs to me that if I use three, I could use the feel at home option to send a text back to the UK on, say, a 3 monthly basis just to keep the number alive. Any thoughts on this.