líkāi qián bǎ tā fàng zài qiánbāo huò shǒujīké lǐ, bié suíshǒu sāi jìn wàitào kǒudai

离开前把它放在钱包或手机壳里，别随手塞进外套口袋。

Put it in your wallet or phone case before leaving, and don't just stuff it into your coat pocket.