The standard 3.5-millimeter headphone jack, it's everywhere, your computer has one, your smartphone has one, even car stereos have them. There's a rumor going around that the new iPhone 7 might NOT have one. According to Mac Otakara, a Japanese tech site, Apple just might cut the 3.5 headphone jack from its new phones. But that doesn't mean that you wouldn't or couldn't use headphones. You're familiar with a lightning cable right? The one Apple switched to with the iPhone 5. Well, Apple introduced the MFi specification for Lighting-based headphones last year. It looks like Apple may have been planning a transition away from the headphone jack for a while.
Mac Otakara says the new iPhone will come with Lightning-based EarPods, and will support third-party Bluetooth and Lightning-based headphones. If you want to continue using those $400 headphones with the new iPhone, you will need an adapter of some sort.
If this is true, it would be in typical Apple style to "pull the plug" on the 3.5-millimeter headphone jack. After all it was Apple that killed the floppy, the CD drive and the USB on the recent MacBook (which only has the USB-C and a 3.5 millimeter headphone jack).
It will be interesting to see what you will be able to do with a lightning based headphone jack. Will you be able to charge and use headphones at the same time? Will this make the phone even thinner? Remember, this is just a rumor, it just happens to come from a pretty good source.