These are not unlimited but you can enjoy some minutes for free.For anonymous calling try different email ids.(use dot trick)
1. http://talkster.com
2. http://rebtel.com
3. http://spoofcard.com
4. http://voipraider.com
5. http://icall.com
6. http://freeipcall.com
7. http://evaphone.com
8.http://m.ibibo.com
9.http://m.mig33.com
10. http://m.talki.me
11. http://minowireless.com
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