Vodafone m1 (Samsung gt-i6410) headphone jack cable broken?

Question

Mobile devices

The cable from the headphone jack is torn and now the phone thinks that the headphones are connected, therefore there is no sound (there is only when talking with the loudspeaker turned on) and I hear a melody when they call me, but when I turn on the song in the player, I hear silence alas. the radio does not ask for headphones, but just hisses ... How can I explain to the phone in software that the headphones are turned off? Some kind of program to switch the mode or something like that?
And can anyone advise where to buy (ala ebay) a headphone jack with a cable (or cable) for this phone?