Xarmanla is correct; http://www.grammarerrors.com/grammar/different-from-than/

Different from is almost always acceptable. Different than should be used only before a clause. This may be different than you had expected.

The debate over different than/from rages in several internet blogs. I personally distinguish between the two.

different from" and "different than can be used interchangeably Spanish is different from Italian Math is different than English

Can you give an example of using "different than"? I can't think of one.