Spanish cloud telephony provider FonYou has announced that its XtraLine solution is now available to mobile operators as a white-labelled iOS and Android app. Spanish incumbent Telefónica is the first carrier to launch the app. The solution, which was deployed in a trial earlier this year by Telefónica, enables mobile operators to provide consumers with a second phone line bundled with a range of rich services like visual voicemail, call registers and advanced voice screening.