Unable to find Junk folder on iPhone 13 Mini

for what type of email account?

I have both iCloud and Gmail in my Mail app..

If I open Mail, it is typically in All Inboxes. In the upper left, tap < Mailboxes

Then I see All Inboxes, iCloud, Gmail all listed.

Below that there is another listing of iCloud and Gmail, tap on one of those and it will expand so that all the mailboxes for that account are shown. Junk should be listed among them.

tap on edit and see if the junk or spam folder is selectable

You have a question for Btinternet support. The iPhone will only display the mail information that Btinternet provides.

Get support for your BT Email | BT Helphttps://www.bt.com › help › email

Did you contact Btinternet Support? The answer will come from them or another Btinternet user who knows and might see this thread.

Please post back your results if you can......to help other users who might have the same question.