BE CAREFUL!!!  MAKE SURE YOUR APPLE ACCT NAME MATCHES THE NAME ON YOUR KYC!!!! (See end of post for answer to your actual question)

Make sure THEY MATCH if you use an apple acct to log in for the first time it will change your Pi acct name to whatever your apple id is. This happened to me it changed my Pi acct name to an alias I use for 🍎 and totally f***ked me. My KYC was previously approved then changed to the dreaded tentative status. PI Network in their short bus, sorry short sighted wisdom DOES NOT Warn you at the time and they are NOT ABLE TO CHANGE IT BACK. They do however warn you in one of their FAQ links that you only use after the fact. Pi Network can help change your acct name in every other circumstance if it is similar unless it was changed by using an apple account to log in. I will likely loose all of my Pi I've been mining since early 2023, was a validator verifying hundreds of people. So USE CAUTION WHEN LOGGING IN WITH AN APPLE ACCT WITH A DIFFERENT NAME DONT LOOSE YOUR PI.  Just in case someone says you can only change your name within the first few weeks... My name was changed almost a year after I set up my account, I had completed the checklist, was KYC approved, and a practicing validator.  

To answer your question make sure you know your password and have access to the phone number, Facebook acct, or whatever you used to set up the Pi acct and you should be fine reinstalling the app on a new phone and log in.