An Apple patent published in September 2010 revealed the company was working on a new headphone jack design that would allow to place significantly smaller headphone jacks in future iPhones and iPods.

The latter involves slimmer form factors that could be at odds with the size of the 3.5mm headphone jack even as smartphone manufacturers continue to subscribe to the less-is-more approach to ...

See: Headphone Jack (3.5mm) 2.5mm connectors are still common for TTY devices for the hearing impaired. Therefore most modern phones require a 3.5mm-to-2.5mm adaptor in order to connect to a TTY ...