1. The info page reads, "All characters start with a smartphone! Even with amnesia, they somehow know how it works."
But as how to use the phone is the only thing established that all characters should know waking up in Imeeji, it's totally fine if it's the only knowledge she's been given, with no other context! She can (and probably should) find running water, elevators, cars, light fixtures, and anything else you wish to be mysterious and strange! She also probably can find the phone mysterious and strange, but somehow she knows how to call a Live and use it to open doors. It's like someone downloaded the information into her head, rather than if she'd learned it normally and has context for it and just forgot.
no subject
But as how to use the phone is the only thing established that all characters should know waking up in Imeeji, it's totally fine if it's the only knowledge she's been given, with no other context! She can (and probably should) find running water, elevators, cars, light fixtures, and anything else you wish to be mysterious and strange! She also probably can find the phone mysterious and strange, but somehow she knows how to call a Live and use it to open doors. It's like someone downloaded the information into her head, rather than if she'd learned it normally and has context for it and just forgot.
2. Regular skills are fine to keep!
3. That's correct, that's gone.