I heard this story that 900 Mhz cordless phones aren’t allowed in Taiwan. The reason behind it is that supposedly the FCC there licensed that frequency range to cellular phones, and cordless phones using the same frequency would interefere with cellular function. On the surface, this sounds plausible since the government does license frequency ranges to prevent cross-interference. But, I was also under the impression that some cell phones here in the United States also use the 900 Mhz range so clearly cordless phones and cell phones can coexist. What do you guys think of this story, and does anyone know for sure?
Actually, aren’t cell phones almost all in the 2.2-2.4 ghz range?
Cell phones in the states are either 800 MHz or 1900 MHz. This is licensed spectrum. The carriers Sprint, Verizon etc. must get a license from the government to use this spectrum. Nobody else can use the spectrum for a given geographical area. Your cordless phones will not be in either of these spectrums.
Cellular phones’ lower band is 824-894 MHz. The cordless telephones work in the International Scientific and Medical Bands, which are unlicensed, at 902-928 MHz, and 2.45-2.483 GHz. The ISM bands are used for wireless lan systems and newer, spread-spectrum cordless phones, among other things. The Broadband PCS band is in the 1.8-1.95 GHz range, and there are some public mobile applications in the 2.1-2.2 GHz area that aren’t specified as being for cellular phone use spefically, but these are both well shy of the second ISM band. 2.2-2.4 GHz is reserved for amateur radio and space research, according to this:
http://www.fcc.gov/oet/info/database/spectrum/spinvtbl.pdf
When it comes to international communications standards, most countries default to the FCC, and I can find nothing to the contrary regarding Taiwan. It’s not in their best interest to re-allocate cellular phone bands to the ISM band, as that would make Taiwanese cell phones Different.