Jitterbug devices are primarily designed for use within the United States. They operate on networks that may not support international roaming, which means that their functionality outside the U.S. can be very limited or even unavailable. Users often find that they may be unable to make calls, send messages, or access data when traveling internationally. However, some Jitterbug users have reported that their phones may function in specific circumstances, such as if they are visiting certain countries where the carrier has agreements in place. It is important for potential travelers to check their phone's capabilities and the roaming agreements specific to their carrier. For the most accurate and up-to-date information, it is advisable to refer to the official Jitterbug website.