How to Access Field Test Mode on iOS [2024]

Field Test Mode is a secret menu in iOS that offers helpful details about the network connection and cellular signal strength of your iPhone.Although the normal user might not need to use it, it can be useful for diagnosing connection issues, determining the signal strength in various locations, or finding out more about how well your iPhone uses cellular data.

It’s worth noting that while Field Test Mode provides useful information, it is primarily intended for advanced users, network technicians, or those with a specific need for analyzing cellular data. Making changes or adjustments within Field Test Mode without proper knowledge or understanding can potentially affect your device’s connectivity.

While accessing the Field Test Mode may not be necessary for most users, it’s an interesting hidden feature that showcases the advanced capabilities of iOS. It provides a deeper level of insight into your iPhone’s cellular performance and can be particularly useful for those in areas with poor coverage, traveling to new locations, or for troubleshooting connectivity issues.

Here’s how you can access the hidden Field Test Mode on your iPhone.

1. On your iPhone, open the Phone app. It is accessible from your home screen.
2. Tap on the keypad symbol at the bottom of the Phone app to open the dialer.
3. Dial *3001#12345#* using the keypad. Make sure to enter the digits and symbols accurately.
4. Once you’ve entered the code, press the call button. This will initiate a call to the Field Test Mode.
5. The Field Test Mode app will launch, replacing your usual signal strength bars with a numerical value in decibels (dBm). A lower dBm value indicates a weaker signal, while a higher value indicates a stronger signal.
6. You can explore different sections within Field Test Mode to access more detailed data about your cellular connection. These sections may vary depending on your iPhone model and iOS version, but common information includes:
   Serving Cell Measurements:
   Provides details about the current cellular tower you are connected to, such as cell ID, signal strength, and more.LTE
   Shows details about LTE (Long-Term Evolution) networks, such as carrier information, band information, and signal strength.UMTS
   Shows information related to 3G (UMTS) networks, including signal strength, carrier information, and more.GSM
   Provides information about 2G (GSM) networks, including signal strength, cell ID, and more.
7. Depending on your iPhone model, you can swipe up from the bottom of the screen to exit Field Test Mode and return to your home screen by pressing the home button.

Remember, use Field Test Mode responsibly and only make changes or adjustments if you have a thorough understanding of the potential consequences.