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Yes, use canonical on the mobile page and point it back to the primary www. version. Rand actually mentioned this in his post the other day: Answers to 43 Questions About Search, Social, Content, Conversions and More: Question from Ken Savage: _"@kensavage _@randfish love to know more about canonical issues with site redesigns. When to use them or do I 301 bunch of weird urls?" Rand's Answer: If possible, most SEOs generally like to use 301 rewrite rules. They scale nicely - even if you have 500,000 pages of product URLs that all need to change, a single 301 rule through .htaccess can often address the problem - and they're still a best practice. I'd lean more towards canonical when you have a specific reason to want to keep the page accessible to users in multiple formats, e.g. print/mobile-friendly versions of articles or the same product with different image views.