To allow pop-ups on an iPhone, the steps differ slightly depending on whether you use Safari (the default browser) or Chrome.

Allow Pop-Ups on Safari (iPhone)

1. Open the Settings app on your iPhone.
2. Scroll down and tap Safari.
3. Under the General section, find Block Pop-ups.
4. Toggle Block Pop-ups off (the switch should turn gray) to allow pop-ups.
5. To see the effect, refresh the webpage where you expect the pop-up or close and reopen Safari

If you want to allow pop-ups only temporarily for a specific website, you can turn off Block Pop-ups while on that site and then turn it back on afterward to avoid unwanted pop-ups elsewhere

Allow Pop-Ups on Chrome (iPhone)

1. Open the Chrome app.
2. Tap the three dots menu icon in the bottom-right corner.
3. Select Settings.
4. Scroll down and tap Content Settings or Site Settings.
5. Find Block Pop-ups and toggle it off (the switch should turn gray) to allow pop-ups.
6. Exit settings and refresh your browsing page to allow pop-ups

Remember to re-enable pop-up blocking when you no longer need pop-ups to avoid intrusive ads or unwanted windows