Yes, both Slack and PhoneWagon offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
PhoneWagon is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for PhoneWagon Starts at $39/Month when Billed Yearly.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to PhoneWagon includes CallRail, Calltracks, CallView 360, calltrak, TeleCapture, CallRoot, Call Tracker, Caller Insight, CallTracking and FreeCallTracking.AI.