When some mobile phones are used near some hearing devices (hearing aids and cochlear implants), user may detect a buzzing, humming, or whining noise. Some hearing devices are more sensitive than others to this interference noise, and phones also vary in the amount of interference they generate.
The wireless telephone industry has developed ratings for some of their mobile phones to assist hearing device users in finding phones that may be compatible with their hearing devices. Not all phones have been rated. Phones that are rated have the rating on their box or a label on the box.
The chart here shows the HAC Rating for each BlackBerry device.
The ratings are not guarantees. Results will vary depending on the user’s hearing device and hearing loss. If your hearing device happens to be vulnerable to interference, you may not be able to use a rated phone successfully. Trying out the phone with your hearing device is the best way to evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less interference to hearing devices than phones that are not labeled. M4 is the better/higher of the two ratings.
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.
The radio frequency (RF) exposure standard for wireless devices employs a unit of measurement known as the Specific Absorption Rate (or SAR) which is a measure of the amount of radio frequency energy absorbed by the body when using a wireless device (e.g. mobile phones). The SAR limit adopted by the Federal Communications Commission (FCC) and Industry Canada (IC) is 1.6 W/kg averaged over 1 gram of body tissue.
The chart below lists the SAR for each BlackBerry device.
SAR tests are conducted using standard operating positions with the wireless devices transmitting at its highest certified power level in all tested frequency bands. While there may be differences between the SAR levels of various wireless devices and at various positions, they all meet the government requirement for RF exposure.
For body-worn operation, the mobile phone meets FCC RF exposure guidelines provided that it is used with a non-metallic accessory with the headset at least 10 mm from the body. Use of other accessories may not ensure compliance with FCC RF exposure guidelines.
More information on SAR can be found on FCC website, https://www.fcc.gov/consumers/guides/specific-absorption-rate-sar-cell-phones-what-it-means-you
|North America Models||HEAD--SAR (W/kg over 1 g of tissue||BODY WORN--SAR (W/kg over 1 g of tissue)|
|FCC ID||Model||IEEE Std 1725 Version|