Hi @Roberto_Daniele,
This issue could happen if a different Material Icons font than the one shipped with Radzen.Blazor is loaded. The Material Icons font is the thing which provides the icons. I suspect the Samsung Galaxy Note 9 has an older font installed which takes precedence and you are using an older version of Radzen.Blazor which gets affected by that. Long story short try updating Radzen.Blazor to the latest version.