BGR writes, Nokia (NOK) just issued a positive fourth-quarter warning in Helsinki, stating that the Mobile Phones unit and Lumia phones beat company expectations. The reported Lumia shipment volume of 4.4 million units is very close to the European sell-side consensus expectation; actually 100,000 units above the mid-December consensus. Nokia’s share price has plunged over the past three days due to rumors about a cheap iPhone from Apple. Now, Nokia’s stock price shot up 14% in Helsinki after the new comments from the company came out. Lumia volume of 4.4 million units for the Christmas quarter is an…