To allow pop-ups on an iPhone, follow these steps:
Open the “Settings” app on your iPhone.
Tap “Safari” in the list of options.
Tap the switch next to “Block Pop-ups” to turn it off.
Close the “Settings” app.
Please note that some websites may use pop-ups to display advertisements or other unwanted content. Allowing pop-ups for all websites may increase the risk of encountering malicious or annoying pop-ups. You may want to consider using a pop-up blocker or an ad blocker to protect against unwanted pop-ups.