Are there any longer range cordles phones available in the U.S.? Or
signal boosters?
If so, would their frequencies interfere with 802.11G Wi-Fi?
Michael Hale

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Clarification of Question by halebsky-ga on 27 Mar 2006 11:33 PST

By longer range, I mean a couple hundred feet. My 5.4Ghz phone doesn't
cover both floors of the house or the yard. I believe that 900Mhz
phones are the ones with longer ranges. If so, is there any downside
to that frequency or instruments?
I have 802.11g wi-fi in the home.
Thanks.

Define longer range.  Boosting the signal beyond a certain point would
probably be illegal.

Yes, In USA long range cordles phones are available and it is ligal also.

Some Of Brands which manufactures long range cordless phones with specification 
SENAO LONG-RANGE CORDLESS PHONES 
Model No.   SN-768U SN-738S SN-736 SN-628 SN-328 S-325 
RANGE (KM)  12-20   12-20   2-4    2-4    0.5    0.5 
OUTDOOR ANT  *        *      *      *     NA      NA
CAR ANT    OPTIONAL OPTIONAL OPTIONAL OPTIONAL 

For more information on manufactures 
<http://www.globalsources.com/manufacturers/Long-Range-Cordless-Phone.html>


About your Second doubt
  Wireless phone handsets designed for connection with a local wired
service, not using traditional mobile phone networks, most commonly
using digital technologies being DECT, 2.4 GHz unlicensed spectrum or
802.11a/b/g standards-based wireless LAN technology. As they use IEEE
802.11g as one of the standard for Wireless phone handsets and if you
have any Wi-Fi system with IEEE 802.11g standards frequency will
overlap.

But effect of frequencies interfere depends on
[i]Signal Strength (In the sense how far systems are apart from each other). 
[ii]Method of modulation used in each system. 

 
Suggestions.
 If you have already any system with IEEE 802.11g, then go for
Cordless Phones or Booster which uses other standards.

 More Info On BandWidth(Frequency)

Frequencies For Cordless Phones
In the United States, there are six frequency bands that have been
allocated by the Federal Communications Commission for use by cordless
telephones. These are:

(1)1.7 MHz [1] 
(2)27 MHz (allocated in 1980) 
(3)43?50 MHz (allocated in 1986) 
(4)900 MHz (902?928 MHz) (allocated in 1990) 
(5)2.4 GHz (allocated in 1998)[Frequencies Overlaps with IEEE 802.11G
but modulation method is orthogonal frequency-division multiplexing
(OFDM)for 802.11G ]
(6)5.8 GHz (allocated in 2003) 
Virtually all telephones in current use use the latter three bands.

Frequencies For IEEE 802.11G 
In June 2003, a third modulation standard was ratified: 802.11g. This
flavour works in the 2.4 GHz band (like 802.11b) but operates at a
maximum raw data rate of 54 Mbit/s