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Open the Settings app on your iPhone.
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Scroll down and tap on Safari.
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Find the Block Pop-ups option. It will likely be under the General section.
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If the toggle switch next to Block Pop-ups is green, then pop-ups are currently blocked. Tap the switch to turn it off (it will turn white).
Important: While allowing pop-ups can give you access to certain website features, it also means you'll see more pop-ups, some of which can be malicious. Be cautious when interacting with pop-ups, and only visit websites you trust.
For other browsers:
The method for enabling pop-ups might be slightly different for other browsers on your iPhone. You can usually find the option within the browser's settings menu, under a section like "Content settings" or "Privacy."