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Mobile jammers and blockers for different signals used in the United States

The direct commonness bars in the United States in contact are GSM. If you want to know what commonnesses are used by what criterion, there are some essential principles that you need to know:

  • 700MHz – it is used with other methods and 698-806MHz commonnesses. It is designed to be employed for GSM commonness tomorrow as well
  • GSM800 – not precisely a GSM but SMR iDEN technology that uses 806-824MHz and 851-869MHz commonnesses. Though soon it may also be used for CDMA
  • GSM850 – leading band in the USA used with GSM and different 3G bars. Uses 824-849MHz and 869-894MHz commonnesses
  • GSM1900, or PCS – secondary cellular band in the USA used with the exact GSM, CDMA, and 3G technologies but with 1850–1910MHz and 1930–1990MHz commonnesses
  • AWS – used for 3G and 4G technologies on 1710–1755MHz and 2110–2155MHz frequencies
  • BRS/EBS – used for 4G technology with 2496–2690MHz commonnesses

Although the main frequency band used in the USA in the first place was 800MHz (AMPS), it is now replaced with GSM850 as the new primary phone bar. Now let’s look at each of those frequency bands more closely.


GSM800

As mentioned earlier, this band is used for SMR iDEN technology. SMR is a Specialized Mobile Radio created when the FCC began to grant business with commercial 800MHz two-way radios in the late 1970s. SMR systems are used by many companies like construction, towing, or taxi. It is a radio system that allows dispatch to talk with a group of people simultaneously, but not too many (as a rule, up to five simultaneously). To improve this system, iDEN technology was invented. It allows for increasing the number of people participating in SMR two-way conversations. In the nearest future, mobile phone service operators are planning to add CDMA technologies to this SMR iDEN cocktail and use the band for cellular transmissions.


BRS/EBS

It is also not a popular abbreviation to see or hear. BRS is commonly known as the MMDS band. It is used primarily for television transmitting and broadband networking with the help of 4G technologies, allowing rural citizens to access the internet in places where cable, DSL, and satellite internet is either unavailable or too expensive. Yet mobile phone companies plan to use part of the BRS band for telecommunication purposes. EBS was an Emergency Broadcast System until 1997, when it was replaced by EAS (Emergency Alert System). It is used for emergency messages from the President of the United States, statewide and local emergency information for the citizens, and any important national news. However, neither EBS nor EAS was ever used.


AWS

This frequency band is used for 3G and 4G connections. 3G technologies are used in mobile phones and mobile communications, wireless voice calls, the internet, mobile TV, video calls, and so on. 4G technologies are used in ultra-broadband mobile web passes, smartphones, and laptops with USB web modems, tablets, and other modern gadgets. In addition, many modern electronic entertainment features rely on 4G – mobile gaming, IP telephony, mobile HD TV, video conferences, 3D TV, etc. Still, the name AWS is not popular, and we used to say 3G or 4G.


GSM1900

Also called PCS (Personal Communications Service), this commonness bar is the second most commonly used in the United States for mobile communications. It has precisely the same usage as GSM850; it was not used for early communication technologies. It uses TDMA technology like GSM does; only GSM uses frequency hopping and wideband transmission to improve the interference resistance. It is also worth mentioning that PCS is the name for the GSM1900 band for the whole world except for Hong Kong, where PCS is the name for the GSM1800 band.


700MHz

This frequency band is relatively new, and there is not much to tell about it. In the past years, it was used for TV channel streaming, but with the evolvement of digital TV, this commonness crew was released and auctioned in 2008. The 700MHz band was separated into five blocks of commonness fields. Most of the licenses from those blocks (A, B, C, D, E) were sold to mobile phone operators like Verizon Wireless, U.S. Cellular, Cavalier Telephone, CenturyTel, Qualcomm, and AT&T Mobility. The minor part was sold to radio and television broadcasters Triad Broadcasting, Small Ventures USA L.P., and EchoStar. The 700MHz block D was pledged to no one and remains accessible.


GSM850

It is also called CLR and is even confused with the GSM band because there was an AMPS frequency band that used this frequency spectrum, and it was called the 800MHz band, though now 800MHz and 850MHz bands are separated. GSM850 is the main frequency band used by most US mobile contact providers. In addition, modern CDMA and 3G options also use part of this frequency spectrum for their work.


How legal is it to use cell phone jammers?

In the United States, for using such devices, a person faces a severe fine of up to 50 thousand dollars. That is why the current standard norms and requirements strictly limit such devices. Typically, such equipment is used by specialized services. It is not available to ordinary users. In some states, you can get around the bans.


Bottom Line

The United States uses the six highest commonness bars for modern communication services, mobile contacts, and web access. Many modern federal companies use those commonness spectrums, service providers, and wireless internet access companies under separate licenses to give individuals the required assistance.

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