Also golden call was phone guy who he was killed by golden freddy in night four from fnaf 1/one

His corpse is in the suit (who talking night gurad in night five sound is very creepy)

He was isn't possessing yellow bear Form and also after crying child, Kyle was bitten by Fredbear he was suffering, following a phone guy's Corpse in robot yellow bear suit form he is himself that he gonna possessed him it's working that possessing golden call