you will when they dont work with your N900. they were designed for the iphone, which has a different plug design for the mic. other people have reported the s4i's making a loud buzzing sound as soon as you plug them into the N900. i can confirm the same with other "universal" headsets that were designed to work with the iphone too.

EDIT: apologies if that sounded snide. im just getting a little frustrated with all the contradicting information on this site in the few threads about headsets for the N900. i saw that you posed in another thread that you tried them and had no problems? yet someone else posted the opposite results. its my understanding that this is a hardware issue, so working for some and not the other doesn't seem to make much sense. i would love to get something like the s4i's or some UE's but i don't want to waste my money. i know my palm pre headset doesnt work on my N900 because its iphone style design.