i721 mobile phone user manual, which introduces the appearance, key description, display, battery, network connection, storage card and other aspects of the content, as well as how to make calls, receive/reject incoming calls, send and receive text messages and other common operations
This manual provides safety guidelines, preparation steps, and detailed descriptions of the i721 phone’s appearance, buttons, display, icons, battery handling, and network connections. It also includes quick‑start instructions, menu navigation, input methods, and a troubleshooting section.
The document finishes with a glossary of terms and a technical data sheet that lists dimensions, weight, battery capacity, talk and standby times, supported GSM bands, GPRS capability, and operating temperature limits. This manual is written in Chinese.
| Model | i721 |
|---|---|
| Network | Dual‑band GSM900/1800 |
| GPRS | Supported |
| Dimensions | 101 × 43.6 × 15.3 mm |
| Weight | ≈ 82 g (with battery) |
| Talk time | 180‑300 minutes |
| Standby time | 250‑350 hours |
| Battery capacity | 680 mAh |
| Operating temperature | -10 °C to +55 °C |
Check the charger for faults, ensure the charging environment temperature is suitable, and if the problem persists, contact a Lenovo authorized service center or dealer.
The phone can operate up to a maximum ambient temperature of +55 °C.