Hello, thank you for your feedback, based on which our supplier contacted us and would like to respond below.
"Hello, we have tested your suggestion regarding inserting the Apple iPhone 13 Pro Max. You need to open the holder's clamps to their maximum possible size using the tightening mechanism; once opened, the phone fits into the holder. If the holder's clamps do not open properly, please contact us by email at:
[email protected] and together we will find a solution."
Should you need anything else, please do not hesitate to contact us. Thank you and have a nice day, Ondřej - Alza expert