Side Line by Pinger

Add a free business line to your phone. Free calls + SMS

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This seems like an inferior alternative to Convoi (, which is what I've been using. Made by Citrix and with a very healthy feature set including conference calls (up to 40 people and 4 hours per call), group messaging, voicemail, etc.
I personally prefer which also runs the amazing Uberconference
If you're looking for the catch, one of the reviews states that only the first 20 minutes is free.
@rajington bummer... had high hopes
@kristofertm I didn't actually download it and try it, just went based off of reviews. I just know they're making money somewhere, and a 20 minute time limit would make sense.
Is this limited to 1 extra (USA Only) number or can I add multiple new numbers from any country?