回答

・hold up your smartphone

舉起手機可以用hold up your smartphone來表達。
hold up 在這裡意味著"舉起"。

Simply hold up your smartphone at the time of settlement.
『結帳時只需掃描智慧型手機即可』

I was amazed that the time has come when we can buy a drink from a vending machine just by holding up our phone.
『我很驚訝現在我們只需要掃描智慧型手機，就能從自動販賣機上買到飲料』

有幫助｜0