Offering do-follow links in exchange for Articles

I have a smartphone related website and I'm offering 1 do-follow backlink for each 500 word unique article about mobile news , upcoming smartphones or smartphone reviews.
I'm only offering do-follow backlinks for tech/mobile related websites .

Fell free to PM me for further details.

In what language should the article be in? Can it be in something other than english?

No,sorry. Only english