realme RMX3963 Quick Guide

Welcome & Overview

Greetings from realme mobile. This guide briefly shows you how to use the phone and its important functions. For more detailed information and user guidance, please visit: www.realme.com/global/support.

Important Safety Information

⚠️ Warning

• Do not place the phone or battery near or inside heating equipment, cooking equipment, or high-pressure vessels (such as microwave ovens, induction cookers, electric ovens, heaters, pressure cookers, water heaters, gas stoves, etc.) to prevent battery overheating, which may lead to an explosion.
• When charging, place the device in an environment with normal room temperature and good ventilation. Charging is recommended in an environment with temperatures ranging from 5°C to 35°C.
• The back cover cannot be removed.

Getting Started

How to Reboot the Phone

Press and hold the Power Button and Volume Up Button simultaneously until the realme boot animation appears to reboot the phone.

How to Transfer Old Mobile Content to a New Mobile

If your old phone is a realme/OPPO/OnePlus device, open the "Clone Phone" app and follow the on-screen prompts. If your old phone is another Android device, open the "Clone Phone" app on your new phone and follow the prompts. For iPhone users, scan the provided QR code to download "Clone Phone" and follow the instructions.

[QR Code for iPhone Transfer]

Technical Specifications

Radio Waves Specifications

This device is capable of operation within the following frequency ranges and maximum transmission power (radiated and/or conducted) limits. Availability may vary by network, country, or region.

GSM 850MHz: 33.5dBm; 900MHz: 34dBm; 1800MHz: 31dBm; 1900MHz: 30.5dBm;
WCDMA Bands 1/8: 25dBm; Bands 5/6/19: 24.5dBm; Bands 2/4: 24dBm;
LTE FDD Bands 1/3: 24.8dBm; Bands 2/4: 23.5dBm; Bands 5/18/19: 24.5dBm; Band 7: 24.2dBm; Bands 8/20/28: 25dBm; Bands 26/66: 24dBm;
LTE TDD Bands 38/40: 24dBm; Band 41: 24.5dBm;
5G NR n1: 24.7dBm; n2/n5/n7/n26/n38/n41/n66/n77: 24.2dBm; n3: 24.4dBm; n8/n20/n28: 25dBm; n40: 23.7dBm; n78: 26.2dBm;
Bluetooth: 17dBm;
WiFi 2.4 GHz: 20dBm;
5G WiFi: 5150 to 5250MHz: 21.5dBm; 5250 to 5350MHz: 20dBm; 5470 to 5725MHz: 20dBm; 5725 to 5850MHz: 14dBm;
NFC: 13.56MHz: 42dBA/m @10m

Device Specifications

Note: The SAR values above represent the highest reported values for this device.

Included Accessories

• 1 Phone
• 1 USB Type-C Data Cable [USB-C Cable Icon]
• 1 Safety Guide
• 1 Quick Guide
• 1 SIM Ejector Tool [SIM Ejector Tool Icon]
• 1 Protective Case

Additional Information

This product conforms to the High-Resolution Audio standard defined by Japan Audio Society. The High-Resolution Audio logo is used under license from Japan Audio Society.

The N-Mark is a trademark or registered trademark of NFC Forum, Inc. in the United States and other countries.

The charger's power output must be between a minimum of [5] Watts (required by the radio equipment) and a maximum of [45] Watts to achieve the fastest charging speed. [USB PD Charging Icon]

Content may vary based on device region, service provider, or software version and is subject to change without notice.

This manual is published by realme. realme reserves the right to correct any errors or inaccuracies and to improve its products or software at any time without prior notice. All images are for reference only and may differ from the actual device.

Battery Health and Maintenance

To check battery status, dial "*#*#588#*#*". Information includes:

• Battery manufacturing date
• Date of first use
• Number of full charge/discharge cycles (relative to rated capacity)
• Measured state of health (remaining full charge capacity relative to rated capacity)

The following charging practices can adversely affect battery life:

• Frequent charging
• Charging for extended periods when the battery is at high capacity
• Charging in high-temperature environments

Disabling wireless functions like WiFi and Bluetooth can reduce standby power consumption by approximately 20%, extending battery life.

The following features positively impact battery life:

• Smart charging (automatically enabled)
• High-power charging limit (configurable in Settings-Battery options)

To reduce environmental impact, this package does not include a charger. The device can be powered by most USB power adapters and a USB Type-C cable.

[Energy Efficiency Rating: A to G]

[Durability Rating: 1600x]

[Water and Dust Resistance Rating: IP68]

Estimated Battery Life: 69 hours 41 minutes (under specific usage conditions).