IPhone 6S iPhone 6S and 6S Plus. On March 31, 2017, the iPhone 6S and 6S Plus were released in Indonesia alongside the iPhone 7 and 7 Plus, following Apple's research and development investment in the country. The iPhone 6S, iPhone 6S Plus, and iPhone SE were the last iPhone models to feature a standard 3.5 mm stereo headphone jack. The iPhone 6S is nearly identical in design to the iPhone 6. In response to the "bendgate" design flaws of the previous model, changes were made to improve the durability of the chassis: the 6S was constructed from a stronger, 7000 series
IPhone only available on jailbroken iPhones. The iPhone also features an email program that supports HTML email, which enables the user to embed photos in an email message. PDF, Word, Excel, and PowerPoint attachments to mail messages can be viewed on the phone. Yahoo! offers a free push-email service for the iPhone. IMAP (although not Push-IMAP) and POP3 mail standards are also supported, including Microsoft Exchange and Kerio Connect. In the first versions of the iPhone firmware, this was accomplished by opening up IMAP on the Exchange server. Apple has also licensed Microsoft ActiveSync and supports the platform (including push email)