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i <br /> Interference With Other Devices <br /> There have been concerns raised about cellular and PCS systems interfering with devices such as <br /> hearing aids or pacemakers. <br /> Experts generally agree that all digital devices may cause some level of interference with hearing aids. <br /> However,the level of interference varies according to the type of digital technology used in the handset, <br /> as well as the type of hearing aid used.For instance,initial testing at the Center for the Study of Wireless <br /> Electromagnetic Compatibility at the University of Oklahoma found that the digital technology chosen by <br /> Sprint Spectrum — CDMA— caused lower levels of interference than other digital technologies tested. <br /> • <br /> In any event,all cellular phone makers and cell phone companies are working with the hearing aid <br /> makers and users,and with the FCC,to adopt designs that eliminate any hearing aid compatibility <br /> problem in any phone equipment in which it can occur. <br /> Preliminary results from researchers studying the effects of wireless communications devices on <br /> pacemakers indicate that digital wireless telephones cause interference to some users of cardiac <br /> pacemakers. The researchers recommend that patients dependent on pacemakers avoid using digital <br /> telephones and that nondependent users keep such telephones away from implanted devices. <br /> • <br /> • <br /> • <br />