72873246. Can’t remember my other number (same length, also starting with 7) but I have saved it somewhere. It was the main messenger in Germany when I grew up. It’s really not harder than remembering a phone number, and back then, I used it more often.

On the topic of New ICQ, it looks like all those other multi-user messengers. I wish everyone would switch to Jabber were there are clients for people who don’t have group messaging as their primary use case.