Those who use GrapheneOS seems like rekt and will not be able to receive payments via bolt12. Phoenix wallet should figure out other ways to wake up the app 
Discussion
phoenixd is the answer. Lightning just needs an online device - trusting on some phone wakeup is just a hack and destined to fail under too many circumstances
This exactly.
So then bolt12 implementation inside the Phoenix wallet is pointless ?
Well. Not *pointless*
But it will likely but work equally on all devices/setups, if relying on phone wakeup. See Graphene.
I'd prefer to just have an always-on Raspi with phoenixd running, and be on the safe side
*not work equally (damn autocorrect)
And if you you run also lnbits, you can even connect your phoenixd to Zeus. Here's a package
Don't have Phoenixd, but what i would like is a thin PWA client for mobile that interacts with Phoenixd using nostr.
nostr:npub14tq8m9ggnnn2muytj9tdg0q6f26ef3snpd7ukyhvrxgq33vpnghs8shy62 any plans to implement phoenixd into raspiblitz ? 👀
Node in the phone is not a good idea imo, but there is also many people that want to self custody LN but don't want a dedicate home server for that, so it's not useless, just not optimal. bolt12 is always usefull phone or desktop.
The dialog here informs what to do
They should implement unified push and/or syncing notifications with nostr