Sony XAV-712BT Manual De Instrucciones página 3

Therefore do not rely solely upon any electronic
device for essential communications (such as
medical emergencies).
Remember, in order to make or receive calls, the
handsfree and the electronic device connected to
the handsfree must be switched on in a service area
with adequate cellular signal strength.
Emergency calls may not be possible on all cellular
phone networks or when certain network services
and/or phone features are in use.
Check with your local service provider.
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