“未見其人，先聞其聲”說的是某些人的聲音很有辨識(shí)度，而且聲音比較響亮，人還沒來呢，聲音就先到了。我們生活中有時(shí)候也會(huì)遇到這樣的人，打電話的聲音那叫一個(gè)嘹亮，恨不得周邊一公里的人都能聽到。

Yellular is the loudness one adopts in response to a bad cell-phone connection, in the misguided hope that talking louder will improve the connection.
Yellular指手機(jī)信號(hào)不好的時(shí)候提高音量講話的狀態(tài)，好像那樣大聲講話手機(jī)信號(hào)就能變好一樣。我們可以稱為“喊叫模式”。

這個(gè)yellular其實(shí)就是yell（喊叫）和cellular的合成詞，我們的手機(jī)正式叫法是cellular phone（蜂窩電話），簡(jiǎn)稱cell phone。

Sometimes, some people just cannot help yelling whenever they are on the phone, it seems that their voice is not transmitted through phone signal but via a speaker.
有時(shí)候，有些人只要一打電話就會(huì)開啟大嗓門模式，就好像他們并不是靠手機(jī)信號(hào)來傳輸自己的聲音，而是在通過大喇叭傳話一樣。

For example:

I'm so embarrassed. I went totally yellular at a restaurant last night. I was talking to my dad on the phone, but he just couldn't hear me no matter how loudly I spoke on this side.
昨天晚上我在飯館打電話時(shí)直接進(jìn)入“喊叫模式”，可尷尬了。我當(dāng)時(shí)在跟我爸爸打電話，我在這邊很大聲說話，他也聽不到。

（中國(guó)日?qǐng)?bào)網(wǎng)英語(yǔ)點(diǎn)津 Helen）