Sign in to SBCglobal Email and open your e-mail address book, click the "Options" link in the upper right corner then click the "Import/Export" link. Export your address book as a .csv file and save it to your computer.

Sign in to your Yahoo! Mail then click "Import/Export" in the upper-right corner of your Address Book. In the Import section select ".csv file" from the pull-down menu then browse to locate the .csv file you exported from SBC global. As long as both address books were similarly arranged and set up you should have no problem, otherwise you may need to edit the saved .csv file with Excel before importing it into Yahoo!. Good luck.

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SBCglobal Mail Settings