SMS verification is an obligatory safety barrier for all users. Before you can send a message, you need to verify your mobile number. You can do so on the messaging page or via this link:
Once you have entered and confirmed your number, you will receive a 4-digit code via SMS, which you need to enter on the page where you requested it or on the above link. You receive this code free of charge, of course.
If you haven't received a code within 5 minutes after requesting it, please contact our Customer Support.