T-Mobile has sent out promotional mailers aimed right at the heart of BlackBerry users.The mailer urges T-Mobile customers to make the switch to the Apple iPhone 5s. "Switch to iPhone 5s and get powerful communications and productivity apps — with the ease of use that Apple is known for," says the mailer. Of course, we couldn't disagree with 'Berry fans who claim to get no love from the nation's fourth largest carrier. T-Mobile stopped offering BlackBerry in its stores late last year. Of course, you can always order your BlackBerry handset using telephone sales or online.