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Galaxy S2 thinks headphones are plugged in

Spray some rubbing alcohol in the port....use qtip to swab out any pocket lint....

that's why its best to get a case that has port covers like the Krakken case by Trident Cases

I would not advise doing that with the phone on.

Many rubbing alcohols are only 50% and most top out at 91% the rest is water. For dust, an air dusting spray can works well.

If you don't use your headset port often, a simple fix to keep it clean is to cover it with a piece of Scotch Magic tape.
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