2. If it is a large enterprise, this will not happen, because at least there will be some induction and pre-job training;
3. The general company will use the office phone for invitation or notification.
Please have a look at this market for knowledgeable friends, and don't apply blindly.
Measure yourself, and you'd better go and see it with your partner. Don't be tempted by high technology. Need to know the business scope of this market.