I will reiterate an experience we had before. Stray dog eating the neighbor's garbage, and when I walked over and called he came right to me. His collar had:

1. His name (Archie)
2. His people's phone number
They were woven right in as part of the collar.

He also had brand-new tags, one with his address.

We called, got no answer, so we got in the car, drove there, and Archie was back home within a couple hours of him breaking out of a hole in the fence his owners didn't know about.

Happy dog, grateful owners, and a happy ending. Shouldn't ALL dogs have that chance?