The competition to see how many freebies wireless carriers can cram into a single plan is heating up. Just days after T-Mobile announced it’s giving Netflix to some customers on its unlimited plan, AT&T is upping the ante.

Starting on Friday, all AT&T customers on one of the company’s unlimited plans will get access to HBO for free. If you’re already subscribed to HBO through an AT&T cable or streaming service, you’ll get a rebate for the extra $15 a month, and everyone else just gets access to HBO through the HBO Go app.

AT&T customers on the top-end $90-a-month Unlimited Plus plan already had access to HBO, but this offer extends that to anyone on the $60-a-month Unlimited Choice line. There’s no limits on the number of lines you need to have on the account to be eligible, unlike T-Mobile’s Netflix deal.

Free HBO is on top of an existing $25-a-month credit that AT&T gives to Unlimited customers towards their choice of AT&T video service. It’s a good deal, and all part of AT&T’s push to get as many customers as possible subscribed to a bundle of AT&T services, rather than just wireless. The more services a customer is subscribed to, the less likely they are to switch away — and as we’ve mentioned before, most of the wireless carriers have a big problem with loyalty.

Whichever way you spin this, though, it’s a shot across T-Mobile’s bows. Free Netflix is great, but there’s a few too many restrictions on T-Mobile’s offer to call it a great deal. An HBO subscription typically costs $15 a month, compared to $8 for Netflix, so I think AT&T wins this round hands-down.

Chris Mills has loved tinkering with technology ever since he worked out how to defeat the parental controls on his parents' internet. He's blogged his way through Apple events and SpaceX launches ever since, and still keeps a bizarre fondness for the Palm Pre.