"It is time for Apple to step up to the plate and put the safety of the American people first", the chairman added.
The FM chip has been an unknown part of smartphones for some time, and Pai has made a point in recent years to push phone makers to activate those chips, saying they can provide life-saving help during a crisis.
Pai could easily order Apple's compliance, but he has refrained from doing so because he understands that free market is involved. "The notion that Apple or anyone else would block this type of information is something that we find fairly troubling". LG, Samsung and Motorola have previously activated the FM chip.
But FM can be a vital source of news and information for users during emergencies, Pai said.
USA market and dollar rally on Trump's 'pro-American' tax reforms
An index of European banks rose 1.5 percent as the pan-European STOXX 600 share index rose 0.4 percent to a 10-week high. Due to strength in the IT sector, the tech-heavy NASDAQ Composite Index closed the day at 6,453.26 with a gain of 1.2%.
An Apple spokesman did not immediately comment on Thursday.
Pai wrote that he hopes Apple will "reconsider its position" in the wake of those hurricanes, which have devastated areas of the United States, including Texas, Florida and USA territory Puerto Rico. Chipmakers like Qualcomm and Intel have long baked FM radio tuners into the chips that enable Wi-Fi and cellular connectivity in iPhones and other handsets. Last month, Internet streaming through the app became available on Apple iOS, but the company didn't move to unlock FM chips in their phones. It's still far from ubiquitous-many higher-end phones still do not allow the functionality, and Verizon generally doesn't sell as many FM-enabled devices as its peers-but there's been some change. In Mexico, that number is 80 percent, Pai said. At the same time, he has refused to call for a mandate requiring the chip be activated in the phones and has expressed doubt that the FCC would be able to issue or enforce one.
"In recent years, I have repeatedly called on the wireless industry to activate the FM chips that are already installed in nearly all smartphones sold in the United States", the chairman said in a prepared statement. And that may be enough to encourage the high-profile company to reverse course and activate the chips that already exist in its phones.
Though it may not be obvious at first blush, most smartphones have the ability to stream local FM radio stations directly. "Because you just don't know what will happen".