Saw a post like this recently and can't find it now. I'll repost.
My Headsets/Earphones aren't working anymore since Belle update!
Hello, I have the same problem for two days now, and a soft reset with *#7780# did nothing to fix this matter.
Nokia Belle devs, please release an update to fix this, as the headset works with Anna and the Galaxy S2.
Hey guys! After many days of continuously searching for a solution and spending money I have found something that works 100% for my Nokia X7 Belle.
I tried all types of headphones but nothing worked. So I went out again and bought the Nokia Bluetooth Headset BH-111.
I tried it and it works perfectly! Trust me guys its work buying!
Here's the link - http://www.nokia.com/global/products/accessory/bh-
plus its easy to use!
2012-07-15 2:29 - edited 2012-07-15 3:16
in order to maintain a low profile on the streets, I use an old wh-102 headset on my N8, and it worked - even with a Belle upgrade.
It is possible that the plug in the headset is not plugged all the way in, you should hear a loud click when it is properly plugged in.
I have this problem before, the protective case have a small hole for the headphone jack which prevented the insulator of lhe jack from touching the phone when it is fully plugged in.
At first I thought the problem is related to the Belle upgrade. But after I removed it from the protective case, the 3.5 mm jack plugged in with a loud click, and the headset works like a dream.
Hope this helps.