Starting with iOS 11 and 12, Apple has hidden dBm readings in the iPhone field test mode. The process will vary depending on your device’s make and model. Most smartphones can measure signal strength in dBm through field test mode. How Do I Check My Phone’s Signal Strength? At -120 dBm or lower, your phone is just a paperweight.Ĭell phone signal boosters can help enhance your signal strength for greater reliability. Calls drop, texts take long to send, videos buffer, and webpages are slow. Around -100 dBm is where most experience inconsistent service and weak reception. You’ll be able to enjoy uninterrupted calls and fast data speeds. dBm moves on a negative scale, so –100 dBm is much weaker signal than –50 dBm. The closer you are to 0 dBm, the better your signal strength. It may not be true for all carriers as each carrier has their own dBm to bars conversion standard. Please note: This chart depicts an educational but general assumption. If your outside signal ranges from: Signal Strength What’s a Good Signal Strength for a Cell Phone? Understanding how to find and read dBm is much more accurate and reliable than the bars on your phone. 5G, 4G, T-Mobile, Verizon, AT&T, iPhone, Android.everything runs off dBm. This is true for all cellular devices, carriers, and cellular technologies in North America. In other words, a cell signal strength measurement of -97 dBm is twice as powerful as -100 dBm. Being a logarithmic unit, signal strength doubles every three decibels. They are logarithmic and expressed in negative numbers.Ĭellular signal strength ranges from -50 dBm (great signal or full bars) to -120 dBm (very poor signal or a dead zone). Decibel-milliwatts, or dBm for short, measure the strength of the wave. For Commercial Decibel-Milliwatts: The Most Accurate Way to Test Cell Phone Signal StrengthĬell phone signals are radio waves (AM/FM) operating within certain cellular frequencies.
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