A new German T-Mobile iPhone upgrade policy has angered some first-generation iPhone owners, according to a new report. The company has announced that first-gen iPhone users looking to upgrade to the iPhone 3G will be forced to pay a €15 ($24) penalty for each month left on the prior iPhone’s contract, despite the fact that many paid the full €399 ($626) amount for the phone last year. In addition, reports German site Wiwo.de (Translated…