Samsung SPH-A640ZKAAFT - Manual (Page 178)

156 Section 4A: Important Safety Information
Trumpet Mobile further suggests you experiment with multiple phones
(even those not labeled M3/T3 or M4/T4) while in the store to find the one
that works best with your hearing aid device. Should you experience
interference or find the quality of service unsatisfactory after purchasing
your phone, promptly return it to the store within 30 days of purchase.
With the Trumpet Mobile 30-day Risk-Free Guarantee, you may return
the phone within 30 days of purchase for a full refund.
Getting the Best Hearing Device Experience
With Trumpet Mobile Phone a640 by
Samsung®
To further minimize interference:
ⅷ There is usually less interference on the microphone setting than the
telecoil setting.
ⅷ Set the phone’s Display and Keypad backlight settings to ensure the
minimum time interval:
1. Press Menu > Settings > Display > Backlight.
2. Select Main Display or Keypad and press .
3. Select the minimum time setting (8 seconds) and press .
Ⅲ Use phones with a pull-out antenna. Phones with embedded
antennae may produce more interference.
Ⅲ Position the phone so the antenna is farthest from your
hearing aid.
Ⅲ Move the phone around to find the point with least
interference.