Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
Phonebot - Make phone calls from within a Slack channel
Shuffle - One Phone, Multiple Numbers
Privacy.com - Get a new virtual card for every transaction
Swytch - Unlimited mobile numbers on your existing phone using the Swytch app.
WING - A phone carrier that is actually nice to you.