You can disable images in some mobile browsers (e.g. firefox for android) [0]. That significantly knocks down the size of pages. I have mine set to only load images when on a wifi connection.
If you can use a desktop browser tethered through your mobile data connection, you can use the extension uMatrix [1] to selectively block scripts, css, images, outbound requests, and more. This would allow you to turn most pages into lightweight, text-only pages.
[0] https://support.mozilla.org/en-US/kb/block-or-load-images-ov...