Got a 1520. Microsoft has a scheme where you send in a prescribed format an sms to the above number. They will send you an sms in return giving the gift code through which you can get paid apps for free up to a fixed amount depending on model. Trying to do the same since 2 days. But getting error say. Can't send message. Please try again. Otherwise normal sms is working. Weird! Anyone having the same issue? Thanks.