This is the signal strength reading in decibels. Instead of the traditional signal bars, you should now see a negative number. Dial *3001#12345#* and press “Call” to launch field test mode. Once you’ve done this, open your phone dialer and pull up the keypad. If you’re running iOS 9.2 or below, open your phone’s settings, select Cellular and then Enable LTE. If your phone runs on iOS 9.3 or above, open your phone’s settings, select Cellular > Cellular Data Options > Enable LTE. LTE should also be switched off, since LTE signals may be measured differently than those of earlier generations. To turn off Wi-Fi, open Settings > Wi-Fi and switch it to Wi-Fi off. This lets you see what network you’re connected to (3G, 4G, etc.). iPhonesīefore accessing the field test mode on your iPhone, Wi-Fi should be turned off. You should also be able to find the network generation (3G, 4G, etc.) under Network Type. Depending on your model, the signal strength can be found under Network or Status. To initiate field test mode on your Android phone, open up your phone’s settings and select About Phone. Conducting a thorough site survey, which involves recording signal strength readings in and around your building and property, can be useful when determining whether your company would benefit from a signal booster.įield test mode is typically easy to turn on, although instructions vary depending on the make and model of the device. If you have an active connection, both Apple iOS and Android devices have hidden field test modes that can accurately pinpoint cellular signal strength. How Can You Determine the Cellular Signal Strength in Your Building? It’s even possible for your phone to display four bars when you aren’t receiving a signal at all. In other words, one phone may display only two bars despite receiving a stronger signal than a phone displaying three bars. Plus, because each phone manufacturer uses its own algorithm to determine signal strength, bars can vary significantly between devices from different brands. The trouble with your phone’s signal strength bars is that there’s no industry standard governing them, so they provide an indication of the relative strength of the cellular signal rather than an absolute value. Unfortunately, this happens because these signal bars are not actually an accurate assessment of signal strength. Frustratingly, you may even see bars displayed and still be unable to make calls. If you’ve unsuccessfully attempted to make a cell phone call in an unfamiliar location, then you’ve probably looked to see how many bars are displayed on your phone. What Do Those Signal Bars on Your Phone Really Mean? Practically speaking, evidence of good cell phone signal strength in a residential or commercial building includes the following: At the other end of the spectrum, a signal that’s weaker than -100 dBm is likely too problematic to be useful - resulting in dropped calls and incomplete data transmissions. Signals better than -85 decibels are considered usable and strong, and you’ll rarely see a signal stronger than -50 dBm. Essentially, this means that -77 dBm is a stronger signal than -86 dBm. Signal strength in dBms is expressed as a negative number and typically falls into a range that spans from -30 dBm to -110 dBm, with numbers closer to zero expressing stronger cellular signals. The strength of a cellular signal can be accurately measured using decibel milliwatts, or dBms. If you want to ensure that your family, employees or customers can use their mobile phones in your building, it’s helpful to be knowledgeable about what constitutes good signal strength and how to determine whether you have it. With a strong cell phone signal, mobile device users can conduct personal and company business over the phone without worrying about call quality or stability. A strong cellular signal ensures seamless conversations with fewer dropped calls and faster, more reliable transmissions when sending or receiving data. Cell phones have become foundational for both individuals and businesses when it comes to communication, so it’s more important than ever to have good signal strength in your commercial building.
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