I have a problem with Motorola S305. Whenever I turn on the headset the phone crashes. I send an email support to Nokia and here is what I got for a respond. Hi can, Thank you for e-mailing the Nokia Care Contact Center. Based on your concern, we recommend using only nokia accessories for the N900 so as to prevent any compatibility issues that may occur. I hope the information provided proves useful. If you have any additional question, please don't hesitate to contact us again. To ensure proper handling of your case, kindly continue using the current subject line. Thank you very much for your email. Have a great day. Best Regards, Kristel Avis Email Specialist Nokia Inc.