Marc Seelenfreund, CEO of Siyata, commented, "We are pleased to have the top-ranked Zello app integrated with our handsets and available for use globally.

As Hurricane Irma slams the Caribbean and heads toward Florida, walkie-talkie app Zello reportedly has climbed to the top of the iTunes App Store chart.

Marc Seelenfreund, CEO of Siyata, commented, "We are pleased to have the top-ranked Zello app integrated with our handsets and available for use globally.