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An AT&T store in Washington, D.C., April 21, 2015.
An AT&T store in Washington, D.C., April 21, 2015.
Andrew Harrer—Bloomberg/Getty Images

AT&T unveiled an enticing new perk for its unlimited wireless plan — and it has nothing to do with cellphones.

Starting Wednesday, AT&T "Unlimited Plus" subscribers will have access to free HBO streaming, an offer that's available to both AT&T video subscribers and wireless-only customers, according to a press release.

Both new and existing customers will gain access to the premium cable network automatically. If an Unlimited Plus wireless customers is also subscribed to an AT&T video service — which includes DirecTV Now, DirecTV or U-verse — HBO will also be available on those services for free. And if a customer was already paying for HBO, AT&T will remove the extra charges from the bill going forward.

And that's not the only incentive AT&T is offering for those who sign up for its unlimited wireless plan. Customers who subscribe will also earn a $25 monthly video credit for DirecTV Now, DirecTV or U-verse. The offer lasts as long as a customer remains on AT&T's plan.

In addition to the new perks, the Unlimited Plus plan includes unlimited data, talk, text and 10 GB of Wi-Fi tethering per smartphone. Speeds may slow after 22 GB of data usage per line, the company said.