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by having a permanent/persistent notification. for example KeePass2Android does it pretty well. (usually when the battery saver kicks in it kills these semi-foreground things.)

when the phone starts the user has to first start the app though (and I found this to be true for Signal, Skype and probably for WhatsApp too)

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WhatsApp doesn't have a persistent notification though.

> when the phone starts the user has to first start the app though

Just tested this and this is not the case with WhatsApp. I am on a Samsung and I am not sure if WhatsApp get's any special treatment.

ah, I probably misunderstood the context. KeePass2Android does this to prevent Android from putting it to "sleep", which leads to the in-memory unlocked DB getting unloaded.

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