Normally, your phone should not be accessible to anyone but yourself, so the data on your phone should be safe. If you have to replace it, a Site Admin or the Site Owner can reset your IQ PIN Codes (in case you were using remote opening), so you can activate them on your new phone.

If you were just using Digital Key, your phone will activate itself after logging into the app on your phone and create a new Digital Key. You (or a Site Admin) can block the old one if you choose to do so.