Here's how to clear your browser cache on iPhone, depending on which browser you're using:

To make space in your storage space
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Safari (default browser on iPhone)
1. Open iPhone Settings.
2. Scroll down and tap Safari.
3. Scroll down and tap Clear History, Website Data.
4. Confirm by pressing Clear.

This will also clear your browsing history, cookies, and other website data.

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Google Chrome
1. Open Google Chrome.
2. Tap the three dots at the bottom right.
3. Go to History.
4. Tap Clear browsing data.
5. Choose the time period (e.g., “All periods”) and check “Cached images and files”.
6. Tap Clear browsing data.

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Mozilla Firefox
1. Open Firefox.
2. Tap the three lines at the bottom right.
3. Go to Settings.
4. Tap Data Management.
5. Check Cache (and other items if desired).
6. Tap Clear Private Data.