A disposable phone number is a virtual phone number that is usable temporarily. The temporary number is purchased from a service provider. Calls to that number are forwarded to the user's existing phone.

The Internet phone, also known as a broadband phone, is a digital communications device used for making phone calls via the Internet. It is also a commonly used Voice over Internet Protocol (VoIP) application device.

A mobile phone (also known as a wireless phone, cell phone, or cellulartelephone) is a small portable radio telephone. The mobile phone can be used to communicate over long distances without wires.

Most cell phones sold in North America — especially on contract — are locked to a particular cellular carrier. They can only be used on that carrier's network, so you can't switch to another carrier without unlocking it first.

This type of system works well for both small and large companies. The price for VoIP phone systems averages around $175 to $200, but when combined with a PBX system, can cost anywhere from under $1,000 to over $4,000.