Here's a nice little offer before the madness of Mobile World Congress kicks off: T-Mobile is offering the Nexus 4 (16GB version) for free with two-year contract and $50 mail-in-rebate. But the deal only lasts through Sunday, Feb. 24, so you need to act fast if you want to save some dough.

The Nexus 4 is fairly cheap off-contract from Google Play, so you may want to take that route instead of tying yourself down with a two-year agreement.

The timing, though, is interesting in that we'll likely see plenty of big Android devices announced next week during Mobile World Congress, which means consumer interest in the Nexus 4 may decrease.