Students are encouraged to bring their cell phones in order to contact home while they are traveling. In fact, while in Puerto Rico, students will have access to call home without hassle as most US networks support the island’s frequency so that you can connect to the network in Puerto Rico.
Check this out the links below:
Check out the Cell and Internet section in this article: http://wikitravel.org/en/Puerto_Rico
Students need to check their plan for the European part of the program as there will be extra charges. Calls to Europe tend to be highly expensive and students need to be well informed. A good option would be to register for Skype. With Skype, students will be able to do voice and video calls free of charge. go to http://www.skype.com/intl/en-us/home for more information.