With the new price model, you get $200 worth of free pageviews every month. If your credit card expires, your Google maps will stop working on your website. You should set a calendar reminder to update the expiry date every time you get a new card.
You can create a fully functional web app for iPhone and Android devices just by creating a simple model of it in Excel. This ordinary user is testing his new web app on his phone, with the design still showing in Excel on the large screen.