When the balance of Unicom is insufficient, others will not receive it, and I still have more than 12. Can I receive the previous SMS after recharging?

Insufficient balance does not mean downtime, but it means normal delivery.

In the case of downtime, it is generally not available, including making phone calls, sending text messages and surfing the Internet. However, some people have a good reputation. Some people have an overdraft, that is, a credit line. Even if there is no credit line, they will give you a day to recharge. During this time, you can make phone calls and receive text messages normally. A day later, it really stopped.

In addition, there is no case of recharging before receiving it. Only you can send it. If you send it out, the other party can receive it when it stops.