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I've answered two different questions now, both explaining how VOIP apps don't start on start-up, yet people seem to think they do.
I'm not 100% sure myself, someone linked me to a part of the apple docs, which doesn't really mention anything about auto-starting of apps.
I was originally going on prior knowledge and this answer, but after another person saying that they do, I'm really not sure.
As far as I'm aware, apps only react to push notifications, and can't be launched into the background when a device is turned on.
Can we please clarify whether it is possible to auto-start an app or not?
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Quicker updates It's not a simple answer. Many app developers prefer iOS because it's a much more controlled universe to work within.
Turn on Restrictions from Settings > General > Restrictions and set a passcode. Scroll down, go to Apps and tap Don't Allow Apps.
The time to initial display (TTID) metric measures the time it takes for an application to produce its first frame, including process initialization (if a cold start), activity creation (if cold/warm), and displaying first frame.
Take a look at the UIBackgroundModes section in this document - it seems to state that adding the voip key will autostart an app on boot.
Edit: a sample app seems to confirm this behavior.
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