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Older cellular phones utilizing a TRRS jack utilized the Nokia convention, and were Sub-Mini Thirty-Second (3/32) sized jacks. Then the Sub-Mini was phased out in favor of the more common Mini Phono (1/8) jack. Android, Blackberry, and iPhone all currently utilize the Mini Phono size, although the wiring configuration has two competing conventions.There are an array of adapters available to resolve the various incompatibilities in plug and jack size, as well as competing wiring conventions. Another issue created by Apple (typically the culprit) is the depth of the jack on the device. Originally the Apple iPhone had a jack that was recessed unusually deep in the device, so that regular TRRS or TRS jacks wouldn't fit all the way in. An adapter is available which allows you to fit a regular headset into the recessed area. There's adapters to allow a male Mini Phono to plug into a Sub-Mini jack. There's even an adapter to swap the last ring and sleeve connection around to iPod headsets will work with devices in the Nokia convention, and vice versa.