The new wireless plans will be AT&T's only unlimited offerings for new mobile-phone customers, though existing customers can keep their current plans.
WatchTV will include more than 30 entertainment-oriented basic cable networks-mostly Turner Networks channels like TNT, TBS and CNN, but also AMC and A&E.
A federal judge earlier this month approved the merger of AT&T and Time Warner, handing AT&T a win after the Department of Justice sued to stop the deal, saying a merger would give AT&T unfair leverage over rival pay-TV providers.
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The Ticos were the toast of the town in the 2014 World Cup, as they reached the quarterfinals for the first time. Brazil plays its next game on Wednesday against Serbia at 2 p.m.
WatchTV will also be available as a $15-a-month standalone service, AT&T says, though additional details weren't available as this article was published.
Meanwhile, the other plan is called "AT&T Unlimited &More Premium", which has the same features as the other unlimited plan, but bumps up the video streaming cap to 1080p and offers 15GB of mobile hotspot data per month.
Update: Switching to the new plan and keeping HBO does count as your add-on, as confirmed by AT&T. (Or $160 for a four-line bundle.) Premium runs $80 a line (or $190 for four lines) and also includes the option to add either HBO, Cinemax, Showtime, Start, VRV or Pandora Premium or Amazon Music Unlimited to the mix.
As for Watch, it is devoid of local broadcast channels, as well as ESPN, pro league channels like NFL Network and regional sports networks.
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The new plans also introduce a new entry-level price.
Channels that AT&T (T) doesn't own, like BBC World News and Food Network, are on the service, too. The Unlimited Choice Enhanced plan it replaces cost $65 a month. The Unlimited & More Premium plan will also offer customers a second streaming service of their choice, such as HBO.
Finally, AT&T plans to expand availability of WatchTV at a later date, with even non-AT&T customers getting the option to use it if they want.
People who don't subscribe to one of AT&T's new wireless plans must pay $15 per month for WatchTV.
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A win against Panama on Sunday could see England qualify for the Round of 16 with one game to spare, should Belgium beat Tunisia . During the last World Cup (2014), England was knocked out after just two matches which was a first.