iPhones have special dialer codes that let you access hidden menus for testing signal strength, call info, and network details. These are often used by technicians—but anyone can try them safely.
Below are the most useful secret codes for your iPhone.
📶 1. Check Network Signal Strength (Field Test Mode)
📡 Code:
3001#12345#
What it does:
- Opens Field Test Mode
- Shows real signal strength in numbers (dBm)
- More accurate than normal bars
How to use:
Open phone app
Dial the code
Press call
You’ll enter a hidden network screen
👉 Signal example:
- -50 dBm = excellent signal
- -90 dBm = weak signal
📊 2. Check Detailed Network Info
Inside Field Test Mode, you can see:
- LTE / 5g tower info
- Carrier details
- Frequency bands
- Signal quality
📞 3. Call Forwarding Status
Code:
*#21#
Shows:
- Whether calls, messages, or data are being forwarded
- Useful for privacy check
📵 4. Hide Caller ID (or check status)
Code:
*#31#
Use for:
- Checking if your caller ID is hidden or visible
📱 5. IMEI Number (Phone Identity)
Code:
*#06#
Shows:
- Your phone’s unique IMEI number
- Important for theft tracking and warranty
📡 6. Call Waiting Status
Code:
*#43#
Shows:
- Whether call waiting is active
⚠️ Important Things to Know
- These codes are safe to use
- They do NOT harm your iPhone
- Some features may vary by carrier and iOS version
- Field Test Mode layout can change on different updates
🧠 Why Field Test Mode Is Useful
It helps you:
- Compare real network quality (not just bars)
- Choose better SIM or carrier
- Test 4G/5G performance
- Troubleshoot weak signal areas
📌 Conclusion
iPhone secret codes unlock hidden tools like network strength testing and call settings. The most powerful one is Field Test Mode (3001#12345#), which gives real signal data that normal settings don’t show.
Disclaimer:
The views and opinions expressed in this article are those of the author and do not necessarily reflect the official policy or position of any agency, organization, employer, or company. All information provided is for general informational purposes only. While every effort has been made to ensure accuracy, we make no representations or warranties of any kind, express or implied, about the completeness, reliability, or suitability of the information contained herein. Readers are advised to verify facts and seek professional advice where necessary. Any reliance placed on such information is strictly at the reader’s own risk.
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