With inexpensive unlimited plans now regularly promoted by carriers and consumers less worried about overage charges, free Wi-Fi spots aren’t as popular as they used to be.

“Customers are rational,” Craig Moffett, an analyst at MoffettNathanson told Bloomberg. “When pricing incentives favor Wi-Fi, customers use more Wi-Fi. When pricing incentives shift, so does behavior.”

With the right data plan, a mobile phone can serve as a Wi-Fi hotspot for a laptop, as well. The signal from a mobile device is often stronger than the one found by tapping into a coffee, airport or hotel Wi-Fi source. Open Wi-Fi spots are also more easily tapped by hackers.

A ReportLinker survey even found that many Americans, including the majority of younger ones, are using their mobile phone to access the Internet at home. ReportLinker said the mobile…