Can the iPhone be hacked without open access to it?

Problems with whatsapp began, then the code with all contacts changed because "one or more of your devices was logged in or out", then the PIN code of the two-step verification changed and I could not log in to the application, had to reset the two-step verification and create another PIN. After 12 hours, problems with the phone itself began. The password to unlock the iPhone was allegedly incorrect, although I entered it correctly, that is, someone remotely changed it without having a phone in their hands, after which the phone was blocked