After I filed my latest USA Today column–a reminder that it’s still generally a waste of money to rent a cable modem–one of my editors said they would play up the post. He and his colleagues may have used some sort of cheat code, as the column has drawn more feedback than almost anything else I’ve written for USAT since starting this column at the end of 2011.

Among the 100-plus comments and 40 or so e-mails I’ve received since this piece went up Monday morning, the most common queries addressed Internet services that don’t involve any cable-television infrastructure.

AT&T’s U-verse was the most frequent subject of readers’ curiosity, followed by Verizon’s Fios and then CenturyLink’s digital-subscriber-line offering. I didn’t cover them in my cable-modem column because they all branch off the telephone evolutionary tree–AT&T and Verizon use fiber-optic lines built on top of their phone networks, while CenturyLink’s DSL relies on traditional copper phone lines. None depend on the local cable plant; all compete with it at some level.

Am I going to write back to all of these readers to explain that they’ll see my column is properly framed once they understand some first principles about telecom? No.

Many normal people just don’t classify their home Internet service by which regulated local monopoly began building out its infrastructure decades ago or how how high its wires go on a utility pole. The problem isn’t that some think of their phone and cable companies as functional equivalents, it’s that too many others can’t because only their cable operator delivers both television and high-speed broadband.

Besides, AT&T’s policies about U-verse hardware are interesting enough–especially compared to Verizon’s–to justify a follow-up column. Look for that this weekend.