VoipBuster, VoipStunt, InternetCalls: The Attack Of The Clones?

Three brother's softwares, very very similar in the interface and functionality, these softwares allow us to call for free landlines phones in many countries, without time limit, but i red some articles somewhere on the web that said that VoipStunt after a certain number of minutes of free calls (about 40) didn't allow to call the free destination countries and ask for a credit (like SkypeOut) to continue to make free calls over free destinations; it also could be a little bug in the software.
On the contrary, with InternetCalls there's no time limits or calls, will it be true? For settle things once and for all I installed all the three softwares, using them within the time I will find out if effectively will be possible to continue to make free calls without limits.
If it will be not... well, just sign in with a new account and take advantage of more free calls.
Anyhow the italian translation i made for VoipStunt works perfectly also with InternetCalls and VoipBuster.

URLs:

http://www.voipstunt.com
http://www.voipbuster.com
http://www.internetcalls.com