Sony VAIO VAIO PCG505F User Manual page 46

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You need to connect a phone line to take advantage of online services, the
Internet, and Sony Online Support.
Open the phone line jack cover. The cover opens only to a 45 degree
angle.
Plug one end of the phone cable into the jack on the inside of the
phone line jack cover. Make sure you insert the phone cable from the
rear of the computer and that the modular jack clicks into place.
Plug the other end into the wall jack.