Zotero can be used on several different mobile browsers using a "bookmarklet." The "bookmarklet" is a link that saves items directly to the Zotero library from the web.
Instruction for setting up a Zotero bookmarklet are available on Zotero's Download Bookmarklet page.
The set up process will vary slightly depending on which mobile browser is being used. There is also a desktop version of bookmarklet available.