Last time I changed my phone number and backed up my WA chat, it only saved the group chats that I was in but all the chat history hilang because it was linked to my old number. Bopien lo I consider as starting new after that.

I'm not sure if there's any way to transfer the chat history from one phone number to another because I couldn't find a way but that was years ago maybe now there's a way.

Another thing that was troublesome and as you've mentioned is having to change all the things which are linked to my number especially my bank. I know you can change at ATM and all that but last time when I changed my phone number on the website I forgot the answers to my security questions because I made them a long time ago Paiseh have to go to bank to rectify that because I was locked out of my account. Other than that, have to manually change the phone number on all the websites je.

Also, have you considered getting a 2nd phone with a different phone number that is only for personal use i.e., family and close friends only?