Is it okay to use a 900 MHz phone and DSL?

We do not recommend connecting cordless phones of any type near your ADSL modem. The filters available from most service providers are designed to filter out higher frequencies, blocking the ADSL frequencies but not the voice frequencies. Many cordless phones have the same sort of filters built into them to cut down on interference. In fact, any devices connected to the phone line, such as alarm systems, satellite dishes, game console systems, and fax machines, have the potential to cause interference. If you suspect that there may be a problem, remove the device and see if your connection improves.