has anyone else experienced similar probs of low in call volume when using headphones (either those supplied with the product or after-market)? Majority of the time when I talk on the phone I use the headphone/mic. On the S2 I've noticed that in call volume is really low, even when set to 100%. At first I thought this might be due to the headphones that were supplied with the phone but when I changed to my after-market headphones there was no difference to in call volume. The weird thin is that when I listen to music through the headphones even 50% volume is more than loud enough for me. Is this caused by hardware or software fault, any ideas?