If you want to purchase laptop, there are number of brands are available nowadays.
You can chose any one from these. Hp, Soni, Toshiba, Samsung, Dell, Acer and so on.
You can find any unknown number (private number) with the help of Tracking. Download and install this apps.
Call tracker
Call control-Call blocker
Purchase unblock service
To protect their privacy Caller Id can identify the person or the company if the numbers is not blocked.