[b]How can I [b]access free wifi on my Galaxy S4 during 1 week in Paris? I have no data on my local phone plan now. My air bnb will have free wifi, as do many other places. Do I need to unlock my phone to do this, or buy a roaming package? There seems to be only 1 roaming package for Europe available. I'm told I should buy a local SIM card at the airport. Do I need to unlock my phone to use one? I don't need to make calls, but want data for maps and "what's on", as well as a few text messages. Thanks!