Great List. Telecom Recycle is also a very good option if someone is looking to sell his/her business phones.
Line2 is a small business phone service formerly known as Toktumi. It is a virtual phone system you can use with a computer, tablet or mobile phone. The company’s website seems to position this service for entrepreneurs who want to quickly add a business phone line to separate their business communications from personal (hence the name “line 2”). With rock bottom prices, and a streamlined feature set, it’s ideal for startups, entrepreneurs running side businesses, online entrepreneurs, and workers in the gig economy. There is a 7-day free trial. Feature We Like: A widget to get texts directly from people visiting your website — even included in the lowest plan.

The auto attendant feature automatically redirects an incoming call to an extension without the need of a telephone operator, while audio conferencing lets multiple users join a single call. With ring groups, you can share the distribution of incoming calls among group members. As one of the best virtual phone service solutions, VirtualPBX provides ACD queues, an advanced version of ring groups, among its features. Given that it distributes calls to a group of users, this functionality makes managing a call center with large volumes of inbound calls much easier.
Lines and extensions: With an analog phone system you might, for example, pay your telco for two or four lines to allow your business to have that many simultaneous phone calls. For that to work, you'd need a two- or four-line analog business phone system, which are some of the most common analog systems on the market.