So the idea that the gas man can turn up at my mom's door and he can show my mom his phone, and she can tap it with her phone, and it will come up with green if he really is from British Gas and allowed in, and it'll come up with red if he isn't, end of story.
販売されています ガスの検査員が 私の母の家を訪問して 携帯を母に示して 母の携帯でタップした時 ブリティッシュガスの社員なら 青信号がともり 承認されますが 赤信号なら 終わりです