It's unlikely they could hack your phone directly. If they somehow got into the old phone and figured out your various login credentials, they could effectively steal your identity without any interaction with the new phone.
If you register an account here, you can reply to this thread and let us know what you are seeing on your phone that is "acting strange." Usually these sorts of issues turn out to be nothing more than a misunderstanding of how Android works, or some sort of hardware or software bug, and we can help you sort it out.
03-07-2019 08:47 AM