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T-Ratings:
Phones rated T3 or T4 meet FCC requirements and are likely to be more
usable with a hearing device’s telecoil (“T Switch” or “Telephone Switch”) than
unrated phones. T4 is the better/higher of the two ratings. (Note that not all hearing
devices have telecoils in them.)
Hearing devices may also be measured for immunity to this type of interference.
Your hearing device manufacturer or hearing health professional may help you find
results for your hearing device. The more immune your hearing aid is, the less likely
you are to experience interference noise from mobile phones.
Other Medical Devices
If you use any other personal medical devices, consult the manufacturer of your
device to determine if it is adequately shielded from external RF energy. Your
physician may be able to assist you in obtaining this information. Switch your phone
off in health care facilities when any regulations posted in these areas instruct you to
do so. Hospitals or health care facilities may be using equipment that could be
sensitive to external RF energy.
Vehicles
RF signals may affect improperly installed or inadequately shielded electronic
systems in motor vehicles. Check with the manufacturer or its representative
regarding your vehicle. You should also consult the manufacturer of any equipment
that has been added to your vehicle.
Posted Facilities
Switch your phone off in any facility where posted notices require you to do so.
Potentially Explosive Environments
Switch your phone off when in any area with a potentially explosive atmosphere and
obey all signs and instructions. Sparks in such areas could cause an explosion or fire
resulting in bodily injury or even death.
Users are advised to switch the phone off while at a refueling point (service station).
Users are reminded of the need to observe restrictions on the use of radio equipment
in fuel depots (fuel storage and distribution areas), chemical plants or where blasting
operations are in progress.
