If you have Windows, a browser with java and javascript (usually IE or Netscape 4 or higher), a sound card, and a microphone and speakers (or a headset), you can call any shelter in the US using an internet phone from your computer toll-free!
You'll have to register with their websites before you can use any of them EXCEPT I-link.
If you don't have sound, you can still use I-Link or Speak4free on this page to make free phone calls.


To set up an account with Dialpad (online free phone) at their site
Dialpad


To register and use Speak4free ( free phone-to-phone) at their site-no headset required
Speak4free


Another free service which requires a one-time download
Deltathree


To use Talkfree (phone-to-phone)
I-Link
This one will break you out of my frames, so please write down the number first!