Gratis US DID nummer

Today we put together the world's most comprehensive DID number provider's list. If you know a DID provider not listed here please let us know.
1)FreeDigits/TalkDigits/CallDigits/ClickDigits: All managed by SIP Number and all DID services are interconnected. Offers USA numbers for FREE.
2) IPKALL: Ipkall offers free usa incoming DID number. Washington State numbers of 206, 253, 360, 425)
3)IPComms: IPComms gives free US DID number from over 5000 locations in USA. Offers Unlimited Inbound Calling, 2 Incoming ports (VoIP Delivered).

For me, IPKALL works perfect!