*3001#12345#* is a code that allows users to access the Field Test Mode on their iPhones. Field Test Mode is a hidden feature on iPhones that provides detailed information about the device’s cellular network connection. It offers a range of technical data and measurements that can be useful for troubleshooting network issues, optimizing signal strength, and gaining insights into the network performance.
To access Field Test Mode, follow these steps:
1. Open the Phone app on your iPhone.
2. Go to the dialer or keypad section, where you usually enter phone numbers.
3. Enter the code *3001#12345#*
4. Once you enter the last # symbol, the Field Test Mode will be activated immediately, and you will be taken to a screen with various network information and measurements.
Now, let’s dive into the details of what you can find within the Field Test Mode:
1. Signal Strength and Network Information:
– The top left corner of your device’s screen will display signal bars in numbers rather than the usual signal bars.
– You can see the signal strength in decibels (dBm), where a higher negative number indicates a weaker signal and a lower negative number represents a stronger signal.
– Additionally, you can find information about the network operator, current cellular technology (2G, 3G, 4G, etc.), and the frequency band your device is connected to.
2. Serving Cell Measurements:
– This section provides detailed information about the cell tower your device is currently connected to.
– You can view the Cell ID, Tracking Area Code (TAC), Physical Cell ID (PCI), and other parameters related to the serving cell.
– These measurements can be valuable in identifying the specific cell tower your device is connected to and diagnosing network-related issues.
3. Neighbor Cell Measurements:
– In this section, you can find information about neighboring cell towers.
– It displays details like Cell ID, Signal Strength, and Signal Quality for neighboring cells.
– Analyzing this data can help determine if your device is connected to the optimal cell tower or if there are better options available.
4. LTE and UMTS Cell Information:
– This section provides specific information related to LTE (4G) and UMTS (3G) networks.
– You can access details such as the cell’s channel number, bandwidth, frequency, and more.
– These measurements can be useful for understanding the network configuration and optimizing signal quality.
5. Miscellaneous Options:
– Field Test Mode also offers additional options that can be accessed by tapping on the top left corner where the signal strength is displayed in numbers.
– These options enable you to switch between signal bars and numeric signal strength display, view your device’s IMEI number, and exit Field Test Mode.
It’s important to note that Field Test Mode is primarily intended for advanced users, network technicians, and professionals who require detailed network information. Modifying any settings or values within Field Test Mode without adequate knowledge can potentially disrupt your device’s network functionality. Therefore, it is recommended to proceed with caution and avoid making any changes unless you fully understand the implications.
*3001#12345#* is a code that grants access to Field Test Mode on an iPhone. This hidden feature provides detailed cellular network information and measurements, aiding in network troubleshooting and optimization.