Go into Settings > WiFi and turn WiFi Off.The iPhone has a hidden built-in Field Test Mode app. LTE readings are sometimes measured differently from previous generation networks so without knowing if a signal is from an LTE network or a previous network, it’s impossible to interpret the results. When taking a signal reading, you must also keep track of the network (2G, 3G, 4G, LTE, etc.) your phone is connected to.To get readings from other carriers, you’ll need phones from each carrier. Any signal readings you take are only valid for the phone’s individual carrier.Here are a few things to keep in mind about taking signal readings in decibels: Most phones have a setting we call Field Test Mode that can show you useful information about your phone, including the signal strength in decibels. Decibels are a logarithmic unit of measuring signal strength and are very precise making them ideal for performing a signal test of just how strong of a signal is that you’re currently receiving. When experts discuss cell phone signal strength, they measure the signal in decibels. Finally, bars aren’t very granular so for example, saying 3 bars of signal is not being very specific. Even among phones with the same number of bars, there’s no standardization, so the strength of a 4 bar signal on one phone can be very different than a 4 bar signal on another. While many phones show the signal strength on a 5-bar scale, some phones only have 4 bars while others have 8. While bars are an easy way to talk about signal strength, it turns out that it’s not a very accurate way to signal test. When most people talk about cell phone signal strength, they talk about “bars” in reference to the signal strength bar indicator on the phone. One of the first steps to selecting a cell phone signal booster for your home or office, vehicle, or large building is to determine how strong the outside signal is.
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Field Test Mode: What it is and How To Enable it on Your Phone
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