Q:What does post-paid and prepaid plan refer to?

A:Post-paid plan means that all the fees are settled at the end of every month with paying in advance. Prepaid plan means that your account is required to have enough balance before using; otherwise the account will be suspended.

Q:What is 2G and what is 3G? Is there any difference between them?

A:"2G is short for second-generation wireless telephone technology. 2G technologies enabled the various mobile phone networks to provide the services such as text messages, picture messages and MMS (multimedia messages). All text messages sent over 2G are digitally encrypted, allowing for the transfer of data in such a way that only the intended receiver can receive and read it.