Just two days ago Microsoft announced a new trade-in deal for the US and Canada, which can give you up to $250 of store credit if you give up on your old smartphone or tablet. Today Microsoft has extended this deal with a special offer.

If you opt to return your old Apple iPhone 4, iPhone 4S or Samsung Galaxy S II, you can have a Lumia 1020 or Lumia 1520 for free. Your old phone just needs to be working, with no missing parts or pieces. The deal expires on March 2, or until supplies last.