I've had the MagicJack for a couple of weeks now and it seamed to be fine, but today two people have told me they tried to call my # and they couldn't get through. When i try to call from my cell it works, but i'm missing calls, and it does not show on the softphone either.
When I first got my MJ, I could not receive incoming calls from Verizon. I contacted tech support and a few weeks later it was fixed. You might want to find out what Service cannot go through and contact tech support and relay those numbers to them. Call your friends and see what carrier they use.