This document introduces a product related to SIM cards and PIN codes, including the usage of SIM cards, setting and resetting of PIN codes, etc.
The manual explains how to set up the phone for the first time, including inserting the SIM card and configuring basic settings. It also describes the main functions such as volume control, silent mode, and messaging.
Additional sections cover PIN code changes, battery‑low warnings, and warranty information, helping users resolve common issues and understand the product's service terms. This manual is written in Chinese.
The phone will emit a warning tone to alert you.