Data Plan
 

Wondering which data plan covers good network for 5GB over 7 days - AT&T or is it better to take T Mobile? I noticed T Mobile doesn't work well in Las Vegas. I will be travelling to SFO, LA and LV

Either will work fine in cities.

You might want to look at each provider's coverage map to see how it correlates to where in the city you'll specifically be spending time. T-Mobile is great in Chicago, for example, but if you were staying at my old condo it's worthless because we were in a bit of a coverage dead zone.

The providers' coverage maps tend to show blanket, wall to wall coverage everywhere, which isn't an accurate representation of what things are actually like.