A pay-as-you-go phone or internet service is one you pay for before you use it. You put money or data on the account first. You use it. When the credit is gone, it stops until you add more. There is usually no long contract and no bill at the end of the month.

A pay-as-you-go phone or internet service這種門號或網路服務，is one you pay for是你先付錢 before you use it才使用的那一種。You first你先 put money or data把錢或流量 on the account放進帳戶裡。You use it你使用。When the credit is gone當儲值用完，it stops服務就停了，until you add more直到你再儲值。usually通常 There is no long contract沒有長約，and no bill at the end of the month月底也不會收到帳單。

The opposite is a monthly plan, where you use first and pay later. In Britain people say pay-as-you-go, often shortened to PAYG. In American English prepaid is the more common everyday word for the same kind of phone, though pay-as-you-go is still understood.

The opposite相反的 is a monthly plan是月租方案，where you use first那是先使用 and pay later後付費。In Britain在英國 people say人們說 pay-as-you-go，often shortened to常縮寫成 PAYG。In American English在美式英文裡，for the same kind of phone指同一種手機門號時，prepaid is the more common everyday word是比較常用的日常說法，though不過 pay-as-you-go這個說法 is still understood大家還是聽得懂。

Though actually the phrase has wandered: people also use it for parking, travel cards, and even some kinds of work pay, always with the same idea — you pay while you go along, not in one big contract. This entry is the phone and internet one. It feels informal and practical, not fancy.

Though actually不過其實 the phrase has wandered這個片語已經跑出原本的範圍：people also use it人們也拿它來說 parking停車、travel cards交通卡，and even some kinds of work pay甚至某些算工錢的方式，always with the same idea意思始終一樣——you pay while you go along你邊用邊付，not in one big contract而不是簽一大筆合約。This entry這一條講的 is the phone and internet one是門號和網路的用法。It feels它給人的感覺 informal and practical口語又實用，not fancy不花俏。