NII Holdings (NASDAQ: NIHD) is ramping up its offerings for Apple's (NASDAQ:AAPL) iPhones. The company said its PRIP push-to-talk solution is now available for the devices in the United States. The cost to download is $1.99, with the first month of service free.

PRIP, which NII Holdings describes as an advanced solution, is an app built on technology developed by Google's Motorola Mobility. Push-to-talk is a service that allows users to effectively utilize their devices as walkie-talkies, communicating with the push of a button.

In the press release heralding the news, the company quoted Greg Santoro, its executive vice president and chief strategy and marketing officer, as saying that "as our customer demands evolve and new devices enter the marketplace, it is important we continue to expand our offerings to meet their needs." 

NII Holdings is devoting plenty of effort to servicing the iMarket. The PRIP news comes less than a week after the company announced that it will make the latest iPhone models, the 5c and 5s, available for customers of its Nextel Brazil subsidiary. 

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