Commands for text messages:

Block a user: block Yahoo! ID

Block everybody: block all

Unblock a user: unblock Yahoo! ID

Unblock everybody:unblock all

Reset a user reset Yahoo! ID

Send the command from your mobile phone to the following supported wireless carriers:

All U.S. Supported Wireless Carriers—92466

All India Supported Wireless Carriers—58242

TMTouch—17776

Singtel—428801

AIS—83140

DTAC—192466600

Globe—2258800

SMART—258600

Telkomsel—4246000