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①Service Provider 电信运营商
China Telecom is one of the biggest service providers here in China.
中国电信是国内最大的运营商之一。

②SIM card 手机卡
There's no SIM card in your phone and that's why you can't use the mobile internet.
你手机里没有sim卡，这就是为什么你不能上网的原因。

③Service plan服务计划；套餐
Some handsets are free when you sign up to certain service plans.
当你签约一些套餐的时候，有些手机就是免费的。

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.
度假时我没意识到手机是在漫游，所以每个电话都花了好多钱。

⑤coverage (信号)覆盖
Which service provider has a better coverage, China Telecom or China Mobile?
哪个运营商的信号更好呢，中国电信还是中国移动？

⑥top up 充值
I need to go to the shop and top up my mobile phone.
我得去商店给我的手机充下值。
out of data/minutes 没流量了/没话费了
I am out of data.