AdvertisementWi-Fi Everywhere May Let You Roam Free From Your Mobile CarrierMarch 02, 2015NPR StafffacebookEmailThe sun sets as a visitor uses his mobile phone Monday during the opening day of the 2015 Mobile World Congress in Barcelona. Wall Street Journal reporter Ryan Knutson — interviewed from the conference Monday via Skype by NPR's Robert Siegel — says that for some smartphone users, Wi-Fi may be able to replace most of the functionality of a cellphone carrier. (AFP/Getty Images)