Walkie-talkie app Zello has shot to the top of Apple's (AAPL) - Get Report app store chart in America during Hurricane Irma, as Americans look for a way to communicate when phone networks are down.

The app has risen above Alphabet's (GOOGL) - Get Report YouTube, Facebook (FB) - Get Report and Snap's Snapchat (SNAP) - Get Report , in the chart.

Zello started its life in 2007 in Russia as Loudtalks and surpassed 100 million users in February. In the past 24 hours, over 1 million people, mostly from Puerto Rico and Florida, have downloaded it.

Zello allows users to communicate live with people via the app by touching and holding a button. It doesn't require a mobile network but does need an internet connection.

Apple, Alphabet abd Facebook are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL, FB and GOOGL? Learn more now.

Image placeholder title

CLICK HERE FOR ALL OF THESTREET'S COVERAGE OF HURRICANE IRMA

More of What's Trending on TheStreet: