Hi there Tobias and thanks for posting.
We’re excited to see you start your own phone repair service! People like you certainly make it accessible to repair various products and devices. While not required, we do recommend you to look into the iFixit MasterTech Certification program so that you can get a leg up on other competing businesses. Once you pass the exam, we’ll mail you a certificate and window cling so you can display it in front of your business. You can find more information about the certification on [https://mastertech.ifixit.com/|this page]. If you’re still looking for more information, you can contact exams@ifixit.com and the iFixit MasterTech team will get back to you right away.
Thanks and keep on fixing for the world!
Justin