service provider手机运营商
China telecom is one of the biggest service providers here in China.
SIM card 手机卡
There's no SIM card in your phone and that's why you can't use mobile internet.
service plan套餐
Some handsets are free when you sign up to centain service plans.
roam漫游（动词）
On my vacation i didn't realise that my phone was roaming ,i paid a lot money for each call.
coverage信号覆盖
Which service provider has a better coverage,China telecom or China mobile?
top up缴费
I need to go to the shop to top up my mobile phone.
out of data/minutes没流量/没话费
I am out of data.
.top 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.
图片发自简书App
