Hi I've read the posts re mobile phones, SIM cards etc and am quite confused. We have an old Nokia and a new one (unlocked) that we could use in China. My dilemma is that we only need it for emergencies and so the kids can call us from their hotel room to ours if they need to during the night. Otherwise it will only be urgent texts from home. If we took our current locked phones what would we need to do to avoid high roaming charges? The other thing is that we will need a phone for our week in Hong Kong as family live there, and then would have to buy yet another SIM card. My husband reckons we could take our walky talkies for inter room contact & just one mobile for urgent calls, I'm laughing as I type this but he thinks they will work! If they don't it's a heavy item to lug around. Any advice much appreciated!