Wi-Fi Calling lets you talk and text from indoor locations where itâs hard even for a strong cellular signal to reach. Wi-Fi Calling can be used in the Domestic Coverage Area (U.S., Puerto Rico, and U.S. Virgin Islands) and from most international countries.
The U.S. Passport Card. This... is the U.S. Passport Card! This card can be used as an official I.D. in many countries abroad. However, it cannot be used for international travel by air. If you are going to travel to an international destination, you will still need to take your passport book with you.
Originally Answered: What is the difference between a passport book and a passport card? Well, besides the actual dimensions (credit card size vs. 28-52 page 3.5x5 booklet), a US passport card allows you to cross land borders to/from Canada & Mexico (and the Caribbean via boat/ship.) For travel to all other countries and for all international air travel, you will need a passport book.