IOGear GBHFK331 - Manual (Page 20)

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NOTE:
If the phonebook transfer is failed, the speakerphone will announce “Loading 1.
phonebook failed”. The phonebook function varies from different mobile phone
models, and not every mobile phone supports this feature. Please check with
your cellular phone supplier whether your mobile phone model support this
feature.
The phonebook data saved in the speakerphone will be erased automatically
2.
when it is paired with another mobile phone.