http://www.spoofcard.com/ for use with anyphone to anyphone
mods delete under line if cant be posted
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i dont know if it still works, but about 2 years ago i used to call someone and spoof their number to appear on the caller id so it his own number calling him
now alot of people dont answer, so u go to voicemail which thinks its him and plays his voicemails with out password entry