hi guys,
ive had this problem for a while now, no third party headphones work properly with my iPhone (2G). I just bought myself yet another set of headphones that fit my iPhone but they don't work properly like every other set i've bought before. I've tried everything to solve the problem, I've cleaned out the jack with a Q tip dipped in isopropyl alcohol so dirt isn't the problem. The headphones are fine because they work on my sister's iPhone (also 2G) and they actually worked on my iPhone as well when i used a jack extender, the kind made to solve the problem of the recessed jack. So to sum up, everything works perfectly except when I pair the new headphones directly to my iPhone. Also when i plug the headphones directly into the iPhone I can hear a sort of pulse. I would use the jack extender, but that's broken and I had to hold it together to test it with the headphones, so it's not an option.

Link to headphones I'm trying to use

If anybody has any ideas or solutions to my problem please tell me, all help, any help is appreciated. Sending it to apple isn't an option since I live in Belgium and I don't have warranty on it anymore anyways.

Thanks for taking the time to read my huge message, all help will be appreciated once again
-Alex