The FCC has adopted the American National Standards Institute (ANSI) technical standard C63.19 (the 2011 ANSI Standard) to define and measure the hearing aid compatibility of digital wireless handset models operating in frequency range of 698 MHz – 6 GHz.
 
Hearing Aid Compliant phones listed as ANSI 2007 tested having only been tested and designated as hearing aid-compatible under the ANSI 2007 Standard; they have not been tested for hearing aid compatibility under ANSI 2011 Standard.
 
Hearing Aid Compliant phones listed as ANSI 2011 tested having only been tested and designated as hearing aid-compatible under the ANSI 2011 Standard; they have not been tested for hearing aid compatibility under ANSI 2007 Standard.
 
Hearing Aid Compliant phones have been tested and rated for use with hearing aids for some of the wireless technologies it uses. However, there may be some newer wireless technologies, such as voice service over Wi-Fi, used in this phone that have not been tested yet for use with hearing aids. It is important to try the different features of this phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Hearing Aid Compatible phones are made available at Union Wireless retail stores for customers to conduct a physical test of the phone to ensure compatibility with your hearing aid or cochlear implant. Consult your local Union Wireless retail store or the manufacturer of this phone for more information on hearing aid compatibility. If you have questions about return or exchange policies, consult your local Union Wireless retail store.
 
The Apple iPhone 5 has the option for the end user to reduce the maximum power at which the handset will operate (maximum 2.5 decibels). This feature does not function for emergency calls to 911. To turn on hearing aid mode for iPhone 5: go to Settings > General > Accessibility. Hearing aid mode on iPhone 5 modifies the phone’s acoustic settings to improve compatibility with hearing aids set in "T" or telecoil mode. Hearing aid mode reduces the transmission power of the cellular radio in the GSM 1900 MHz band, which may result in decreased 2G cellular coverage.