Technical support via phone (6 am to 10.30 pm) For all customers with premium support, we offer an extended support via phone from Monday to Friday, 6 am to 10.30 pm. A personal support service is very important to us. Due to this reason, you do not obtain the anonymous support of a call center. At Thomas-Krenn.Inc. you obtain the direct access to your personal Thomas Krenn support staff member.