USA data only sim card for short visits and etc?
1. about 2-week visit. is there cheap data only card I could get like the ones in Thailand, for navigation and skype etc, any company and plan you could suggest, could i get it right in the airport, say San Francisco or have to visit local shop?
2. will rent a car for couple of days, don't know how much data will be consumed say for 2 days' drive, such as from SF to LA along coastal highway? does google map have turn-by-turn voice prompt?
3. is there any free navi apps (for android) that is good for driving, preferably with voice prompt? I have used maps.me to walk around by foot in other countries, the free one, doesn't seem to have voice prompt? does Here, Sygic have voice?