This document is a manual about SIM cards, which introduces the usage and features of SIM cards.
This guide provides essential instructions for using the Haishi N70 mobile phone. It includes quick steps to power on the device, navigate the main menu, and access core functions such as SIM handling, messaging, and multimedia playback.
The manual also contains safety notices for airplane, fuel‑station, and traffic use, as well as a troubleshooting section that addresses common issues and proper handling of the device to avoid damage. This manual is written in Chinese.