Disposable cell phones are very useful when traveling overseas. They are usually fairly inexpensive and the user can buy cards with more minutes, if more time is needed. I know many people who use disposable cell phones if they are not in the USA, and don't even take their more expensive phones with them. They will often have their contacts and important information stored on a tablet or laptop so they can access it when necessary.
Some people will even save the disposable phone if they know they will be making another trip into the same country, so they don't have to buy a phone when they get in.