There is no exact answer for this,  A pre move survey packers and movers basically does when their is a huge task to be undertaken like the commercial moment or the bunglow/villa shipments which do compulsory require a premove survey.
Where as, when the shipment is of few goods such as light orders or 1/2/3Bhk house hold stuff the decent packers professionals are well expertised and experienced they explain the customers the procedure on the telephonic conversation and the same is exactly followed. As 99% moment is taken via telephonic converstion itself. But now you have a additional option pre move survey via a video call which helps to remove the confusion from both the side if any.