Yuri, carrying the IRC chat over to mail...
"Since each carrier has its own list of free languages, language links on feature phones will point to origin, which will either silently redirect or ask for confirmation."
This will require some engineering finesse for article content, Read in Another Language, and language dropdown list links. Anything's achievable, just gotta be careful.
"In general, we should manipulate image links in M for carriers who don't allow them, and always redirect ZERO to M unless M is not whitelisted, in which case convince carrier to change their whitelist."
Dan should probably weigh in on that piece, in case there are contractual obligations or bandwidth considerations.