When I call a cell phone on Saturday for work, will it be stupid? Then I leave outside the Czech Republic. It's probably stupid, isn't it? Call for an ad on Saturday.
It depends on where you call ... many companies do on Saturday morning and many do not .... wouldn't it be better to send an email + CV with an introductory letter?.? ... or send it by mail? ... if they are interested so they will call you ... you will only get a faster interview over the phone, that's all ... ☢ ☠ ☣ ☠ ☣ ☠ ☣ ☠ ☢