Test the signal you're on right now.
What the signal test measures
The connection this device is using right now — Wi-Fi or cellular — its round-trip time to our server, and the browser's own estimate of throughput. It cannot read your phone's bars. For a number you can act on, turn Wi-Fi off and run the full speed test on cellular.
How strong is your signal? Read it in dBm
Phones report signal strength as a negative number in dBm — closer to zero is stronger. On an iPhone, dial *3001#12345#* to open Field Test and look for RSRP; on Android, open Settings → About phone → Status (or SIM status) → Signal strength.
| Reading | Signal | What to expect |
|---|---|---|
| −80 dBm or higher | Excellent | Full speed, clear calls |
| −80 to −90 dBm | Good | Fast data, reliable calls |
| −90 to −100 dBm | Fair | Slower data at busy times; calls fine |
| −100 to −110 dBm | Weak | Slow data; turn on Wi-Fi calling indoors |
| Below −110 dBm | Very weak | Calls may drop; Wi-Fi calling or a different network |
Why is my signal weaker inside than outside?
Buildings block radio signal. Metal roofs, brick, concrete, basements and energy-saving window glass can each cost a few bars, and phones differ in how well they hold on. Stand near a window to compare; if the room itself is the problem, Wi-Fi calling carries calls and texts over your home internet instead.
Would a different network be stronger where I live?
Possibly — our three networks reach different places. The address check shows the expected signal on each network at your door, and every plan names the network it runs on, so you can choose the plan whose network is strongest for you before you buy.