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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