The weekend sales of the newly launched iPhone 7 and the iPhone 7 Plus were lower than launch weekend sales of iPhone 6s and the iPhone 6s Plus. Once again, research firm GfK has spooked Apple investors with a report. Apple launched its new-generation iPhone 7 and iPhone 7 Plus in early September and both devices hit the shelves on Sept. 16. The analysis from the German firm concludes that sales were actually 25% lower year-over-year.