Siemens 2 D SP - Manual (Page 34)

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8th step
Go on further voyages of discovery – undertake every-
thing that gives you pleasure and experience the whole
wide world of hearing.
7th step
Telephoning with your hearing instrument
You can telephone in the “normal“ M position. Set the switch on the
hearing instrument to T if you have difficulties in understanding. Place
the telephone receiver behind your external ear against the hearing
instrument and find the most favorable and loudest transmission. You
can activate the telephone coil and the microphone by pressing the
program button so that you can hear the normal surroundings.
Your hearing instrument fulfils the IEC 118-13 standard
with regard to electromagnetic compatibility (concerning
for example interference by external radiotelephones).
If you use a radiotelephone (GSM) yourself, unfortunately
unavoidable disturbances can occur in your hearing
instrument under certain circumstances because of the
high field strengths.
This is certainly unpleasant but no reason for concern.
Your hearing instrument isn’t defective.