eVoice has an extensive support center containing helpful articles to get you started. You’ll also find guides on how to use the different features and even a detailed FAQ section.
Thank you for the great information. Do you know if any of the services you listed above allow to transfer and keep your existing land line numbers? This is the only thing that has kept me from retirering my current provider who is a master playing BOHICA.

American Voicemail offers a wide range of voicemail features, but also includes fax receiving and fax-to-email as well as a virtual phone system to manage your company’s telephone presence. Has some unusual features, such as a service that lets you send and receive text messages on landlines. Packages start at $8.95 a month, flat rate, with no per minute charges. No free trial but advertises “first month free.” Feature We Like: Automated Question and Answer Voicemail. This feature, which costs additional, asks your callers questions, one at a time, and records their answers. Great for taking surveys or phone orders.
That's the basics of UCaaS, but the concept is constantly evolving to include more communication and collaboration technologies. Those capabilities also get tweaked to provide new benefits, sometimes general, sometimes aimed at specific verticals, like healthcare, for example. The key is integration. Voice is becoming integrated with other back-end apps, and UCaaS is making that easier. In fact, it's become so popular that it's seen rapid growth over the last several years as recent research from Statista bears out.