Switch from imap to pop without losing old mails
I have a google business mail account set up with imap on my iPhone 12. I will be changing my email service provider soon. I would like to know how do I retail the old mails on my phone while i switch to the new provider (using the same email address). I have looked all over the internet for a solution to this problem, but can't seem to find any which works with the current iOS system.
Pls advise.
Thanks