In an ideal world, Diablo Immortal will launch at the same time for every single platform. However, due to the nature and constraints of propagating games to mobile app stores, the game could be playable on mobile platforms before June 2.
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Diablo Immortal Launch: How to Link your Battle.net Account In Case of Early Mobile Release
In the Diablo Immortal subreddit, Diablo Immortal Game Director Wyatt Cheng has explained how crossplay and linking your Battle.net account in case of an early mobile release will work.