http://www.hearingaidsdelhi.com/hearingaid_phones.htm
Most new models of hearing aid reduce the interference from GSM phones to acceptable levels if they are more than 2 metres away. Some are also immune to interference when the phone is brought up to the same ear as the hearing aid. The result depends on the level of immunity designed into the hearing aid and the type of mobile phone. Unfortunately many types of older hearing aids are likely to be susceptible to interference making it very difficult to use a mobile phone.
http://www.hearingaidsdelhi.com/
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