How To Use Secret Codes On Nokia Lumia 730 Dual... !link! Jun 2026

In this guide, we will walk you through effectively, safely, and what each code actually does.

While the interface of Windows Phone was known for being clean and user-friendly, beneath those "Metro" tiles lies a hidden layer of software designed for engineers, developers, and service center technicians. This hidden layer is accessed via "Secret Codes" or "USSD codes."

Before diving into the specific codes, it is important to understand what they are and how they differ from standard app functions.

Instantly see if call waiting is active on your current SIM. Troubleshooting and Resets How to Use Secret Codes on NOKIA Lumia 730 Dual...

The is a classic Windows Phone 8.1 device that hides several powerful diagnostic and configuration tools behind "secret codes." These strings of characters, typed directly into the dialer, allow you to bypass standard menus to access technical data, hardware tests, and reset functions. Essential Information Codes

: Type *#3370* (or #3370# ) to turn it off and restart the phone. Half Rate Codec : *#4720#

: Reduces voice quality but can increase battery life by roughly 30%. Deactivate : Type *#4720* to revert to standard quality. Check Call Waiting Status : *#43# In this guide, we will walk you through

The process is identical to making a regular phone call:

Shows the Bluetooth device address.

This is the most critical code for any mobile user. It displays your 15-digit International Mobile Equipment Identity Instantly see if call waiting is active on your current SIM

These are the most useful codes for a Lumia 730 owner. They allow you to test the physical health of your device without visiting a repair shop. If you bought a used Lumia 730, these are crucial for verifying that all parts are working.

The Nokia Lumia 730 Dual SIM holds a special place in the hearts of Windows Phone enthusiasts. Launched as a "selfie superstar," it was one of the last great devices to ship with Windows Phone 8.1 out of the box, offering a PureView camera experience and a removable battery—features that are rare in modern smartphones.