I too had been a loyal user of VoiceNet for many years. I was trying to use them to make a call from a LAX payphone last week, and I kept getting the "this number has been blocked from your area code" recording. It didn't occur to me that VoiceNet might have gone out of business -- I thought the payphone company was blocking my call.
It took this thread to make me realize that they're gone. Even their web site
www.voicenetcard.com is blank. It's actually kind of rude the way they just pulled the plug on everybody without any kind of recording at their phone number or at least a web page to announce their demise.
I tried signing up for TTI. I dislike them asking for my social security number. I typed in 000-00-0000 so we'll see if they still set me up.
Ah well. As much as I hate pre-paid cards I might switch to such cards because the rates are just too good to pass up. Pre-Paid cards are more than half as cheap as the pay-as-you go calling cards.