: Use your phone’s "Field Test Mode" or apps like OpenSignal to find the signal strength in dBm. -70 to -90 dBm : Strong; a basic booster will work well. -100 to -110 dBm : Weak; you need a high-gain booster.
: No signal; boosters cannot create a signal where none exists. buy cellular repeater
: Most modern boosters are "multi-carrier" (wideband) and work with all major U.S. networks simultaneously. : Use your phone’s "Field Test Mode" or