I am not sure if people have started using this. But I came to know about this today while doing research for a different issue.
IBM has developed a mobile app “IBM Doc Buddy” which has information of all the error messages. I see that there was a IBM LOOKAT web tool which was used previously. But IBM has stopped updating it. Now everything is at your fingertips.
You can download all the error messages to your smart phone to search offline. Or you can do search online as well.
For now I seem to prefer Googling on desktop. May be this might be useful somewhere where we need to search by message number.