介紹:

①Service Provider 電信運營商
China Telecom is one of the biggest service providers here in China.
中國電信是國內最大的運營商之一。

②SIM card 手機卡
There's no SIM card in your phone and that's why you can't use the mobile internet.
你手機里沒有sim卡，這就是為什么你不能上網的原因。

③Service plan 服務計劃；套餐
Some handsets are free when you sign up to certain service plans.
當你簽約一些套餐的時候，有些手機就是免費的。

④roam /roʊm/ v. 漫游
On my vacation I didn't realize that my phone was roaming. I paid a lot of money for each call.
度假時我沒意識到手機是在漫游，所以每個電話都花了好多錢。

⑤coverage (信號)覆蓋
Which service provider has a better coverage, China Telecom or China Mobile?
哪個運營商的信號更好呢，中國電信還是中國移動？

⑥top up 充值
I need to go to the shop and top up my mobile phone.
我得去商店給我的手機充下值。

out of data/minutes 沒流量了/沒話費了
I am out of data.