Cell phones are ubiquitous and have become an indispensable part of our daily life. So, it is very important for them to have good signal reception and users expect this from their carriers. But, sometimes in certain locations, inside buildings or even in vehicles we experience instances of bad cellular receptions and it can be quite annoying. To avoid such situations, it is good to use a cellular signal booster. One of the most important factors regarding its performance is gain and the purpose of this article is to give you a detailed understanding of this factor.
The Bars In A Cell Phone
The bars in a cell phone is an indicator of signal strength, but in reality, there is no regulation for this. The best way to measure signal strength is to look for dB i.e. decibel readings in the SIM status section and it is given in dBm. Under normal circumstances, signal reception value falls somewhere between -50 dBm and -115 dBm. In ideal conditions, i.e. closer to cellular towers it will be near to -50dBm.
What Is dBm?
dBm is the unit used to express the absolute power of radio, and fiber optic communication networks. It is the ratio of decibels (dB) to one milliwatt (mW); this unit is convenient as it can express very small and very large values effectively. This unit is used to express signal strength in electronic equipment like cellular phones, cellular signal booster, radio, etc.
-50dBm is considered to be best, -115dBm is a very poor signal and the phone typically shows no service. Listed below are the different values for cellular signal strength and their qualities.
- Greater than -60dBm – This is considered to be excellent signal strength that gives good call quality and internet connectivity.
- -60dBm to -75dBm – This is very good signal strength and the best standard for most of the cellular providers.
- -76dBm to -90dBm – This is good signal strength that provides good enough call quality and internet connectivity.
- -91dBm to -100dBm – This is considered to be below average signal strength that gives spotty calls and slow data transfer speed.
- -100dBm to -115dBm – This falls under weak signal strength that results in dropped calls.
- Lower than -115dBm – There is no signal and you won’t be able to make calls.
So, when purchasing a cell service booster, it is good to select one with a higher dB gain for better call quality.