Boone Ashworth writes: “Support for 3G, the 20-year-old wireless network standard, is ending in the US next year, when the major wireless carriers are planning to phase out service. That means many Trac phones, older Kindles, early iPads, and classic Chromebooks—any device operating on 3G—simply won’t be able to connect to cellular data networks anymore. The Wi-Fi radios on those devices will still work, but their mobile data capabilities are going kaput.”