话费英语怎么说

话费英语怎么说：prepaid phone credit，mobile credit，phone top-up

我需要充值我的话费。I need to top up my phone credit.

你的话费已经用完了，需要充值。Your mobile credit has run out, you need to top up.

我可以在这里充值话费吗？Can I top up my phone credit here?

我的手机话费已经充足了。My prepaid phone credit is sufficient now.

我需要购买一张话费充值卡。I need to buy a phone top-up card.