if you have a mobile phone you can pay for your calls on a monthly contract or you can pay as you go – paying for calls as you make them Zoë: 你猜对了吗？和我们的中国联通一样 ...

O2 is closing down its pay-as-you-go data only mobile SIM services later this month. These SIMs allow you to pay for internet data which you have to use within a certain number of days.