Android, or iPhone if it's not Passport mobile wallet (despite the security of the wallet human error still need to be prevent) shouldnt be consider safe for crypto wallet use because they a vulnerable to attack, but they are applicable for hot wallet use.

Technically, yes. The Google keyboard[/url was said to be used to monitor what user are typing or copy which is why external open-source keyboard are advised for Android phone users.

However, for total privacy you'll need to have some privacy setup on the phone since you're going to have Gmail account on the phone.