Yeah, we weren't real happy to hear about that either. For testing/demo, it was great to use as a free option. But for live service we heavily recommend Groundwire or Acrobits softphone, because it's a one-time fee and provides push notifications. And that's invaluable for reliable inbound calls and SMS.
As far as free option, we usually point people to Zoiper--with the caveat that the free version doesn't do push notifications. To get that, it's a monthly subscription, separate from their phone service with us.