Re: The Roku app does NOT even open on my iPhone despite all of the app updates.
Which model iPhone? What version iOS are you running? And what is the app version? You said "up to date" but that doesn't tell what version you are using. The latest version for one device might not be the same for a different device, so exact data, as always, is more helpful.
In the meantime, you might want to completely remove the app from your phone, then restart the phone, then re-add the app to your phone.
DBDukes Roku Community Streaming Expert
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