What is the standard headphone jack size?

Answer

Most cellular phones rely on headset jacks that are sized at 3.5mm. The same size ports are also found on current models of laptop and desktop computers from all manufacturers.

Some older phones did have a smaller, 2.5mm jack, but as phone manufacturers diversified into making accessories most of these peripheral ports became standardized industry wide. This allowed for more manufacturers to create devices that were compatible with more phones while making it easier for consumers to purchase the product they needed without having to replace their phone in order to use it. Alternately, some phones and some headset manufacturers allow for USB and micro-USB cables to be used instead.

Reference:
Q&A Related to "What is the standard headphone jack size?"
Headphone Jack (3.5mm) is a standard jack. ChaCha!
http://www.chacha.com/question/what-is-the-standar...
A `standard headphone jack cable' usually refers to a 1/4" connector. The `mini' is what is normally found on items like a portable .mp3 player or CD player, which is to say,
http://wiki.answers.com/Q/3.5+mm+headphone+jack
either 1/4, or 1/8" You can buy an adapter either way, at Radio shack. Most of mine are 1/4. the jacks (on the keyboard side) are always female. The headphone side is male.
http://answers.yahoo.com/question/index?qid=201001...
The standard headphone jack size.
http://uk.answers.yahoo.com/question/index?qid=200...
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