Rhonda Worthington talks on her cell phone with a 911 dispatcher as she gets out of her car after her vehicle become stalled in rising floodwaters from Harvey in Houston.

NEW YORK — Roads, refineries and other infrastructure have taken a beating in the Texas and Louisiana regions hit by Harvey — but cell phone networks so far remain largely functional.

One reason: Big carriers brought in supplemental equipment and backup power and turned to drones to diagnose problems.

Four Gulf Coast counties northeast of Corpus Christi, Texas, had more than half of their cell towers knocked out earlier in the week, but crews have been able to restore many of them. As of Wednesday, Aransas County had the heaviest outages, with 47 percent of its 19 towers out. That’s down from 95 percent right after the weekend’s storm, according to data from the Federal Communications Commission.

Throughout the affected region, just 4 percent of cell towers were out. It was just slightly higher at 5 percent in Houston’s Harris County.

While cell phone services fared well, hundreds of thousands of people lost landline or other wired phone services, according to the FCC. Some 911 centers had to transfer calls to neighboring centers, while three television stations lost broadcast capabilities.

All told, the devastating storm knocked out fewer than 400 of the 7,804 cell towers in the affected counties; just 329 were down as of Wednesday. By contrast, Hurricane Katrina disabled more than 1,000 cell towers in 2005.