Vauxhall Astra GTC Infotainment Manual page 136

Phone 135
9 Warning
Operation of radio equipment and
mobile telephones which fail to
meet above mentioned mobile
telephone standards is only
permitted using an antenna
located outside of the vehicle.
Caution
Mobile telephones and radio
equipment may lead to
malfunctions in the vehicle
electronics when operated inside
the vehicle with no exterior
antenna, unless the above
mentioned regulations are
observed.