One guy had reset his phone without backing up his keys. He lost his 3 bitcoin and will never touch it again he said.
Ouch. Starting out in the crypto world requires a bit of a different mindset I guess. You'll have to be so much more careful with your devices if you decided to put your coins on there. I'd think if you went through the trouble of figuring out how to, you'd also understand the risks and the need to keep it safe and in working order...