Hi guys We will be travelling to US in a couple of days. We have leased a SUV while we are there (not sure about the specifics as my wife planned the entire trip herself. I only need to turn up). Can I use my Sony Xperia or Samsung's google maps when I'm there? Also, will the car phone charger here appropriate for use in the hired car or is it better to hire one of their navigation devices? I'm also going to get a local SIM card with data when I'm there. Wouldn't want to use Telstra's roaming.