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A comment on An industry based on missed calls helped bring India online. Parent comment

Re:An industry based on missed calls helped bring India online by maven29 on Saturday April 10, 2021 @05:07PM (#26765115)
Most Android phones let you turn off mobile data and Wi-Fi while the screen is off. Something similar might be at play, since FCM is pretty reliable, even with the most brutal doze parameters and additional power optimization measures imposed by manufacturers.
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Re:An industry based on missed calls helped bring India online by jakub_g on Saturday April 10, 2021 @07:09PM (#26766121)
AFAIU each Android manufacturer has their own ad-hoc battery optimizations and opts-in most apps to it by default and users need to opt out. It's a wild west.

I think stuff might work for a while when screen is off but if the phone lies idle for hours, apps get killed etc. and the phone checks for notifs only once in a long while.

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