I'm thinking about jailbreaking + installing the SIP calling app on the iPod Touch, but I don't want to until I'm sure that there is a reliable service provider. Are there any completely free SIP providers that provide unlimited calls to landlines free of charge?
Any other bonus features such as a personal phone number or ipod-to-computer calls are appreciated, but the most important thing is that it has free ipod-to-landline calls.

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the ipod nano is good mp3 players ar better at leat u can c wat ur playin