englishgirl wrote:I'm sorry this is un-Boglehead of me, but don't be so cheap, and the annoyance will go away. I have no clue how magicjack works, but first impressions count in business, and if you're not answering your return calls because they're getting lost in the magicjack ether, then you're going to lose out on business. So whatever you're saving in phone charges is going to be lost anyway.
Also, (to the OP), have you investigated what you look like on the Caller ID at the other end? Does the Magicjack project the image you want to project? I sometimes receive calls that look really odd on the Caller ID -- a non-standard number of digits, or a name like "SNFC MT-EV" or "Toll-Free Call" or "San Francisco." I don't answer those. Every now and then, one of them leaves a message and it turns out to be a colleague or business that I would have picked up for if I had known it was them. And then I wonder what kind of cheap phone system they have, and if they're saving enough money to justify not getting through.
For my own business, I make outgoing calls on a landline that is registered to my full name, and I have verified that the Caller ID at the other end shows my full name and the number that I want people to call me back on. It works very well for me. My clients take my calls if they are available, and if not they find it easy to call me back. The extra expense seems minor compared to the benefits of making it easier for clients (or potential clients) to contact me.