I've read previous posts about this subject but still need a bit more clarification.
How can I know if a contact has blocked me? I think I may have been blocked by a previously authorised contact, but still see his profile details and everything, I just never see him online.

From reading previous responses to similar queries, I should see him online, but not be able to contact him via chat/phone. Or would I just always see him as offline?

Another response mentioned the blocked user name goes back to ?mark. Does that happen at the blocked person's end, or just to the person who's blocked them?
If he's blocked and removed me from his contact list, wouldn't I then see him as a ?mark at my end and be unable to read his profile details (including no. of contacts which is only visible to contacts)?

If I've been blocked but can see his profile, will I be able to see any updated details to his profile?

Ta.

If you have been blocked by someone then his/her contact goes back to ?mark on your contact list. It makes no difference if he/she has removed your contact from his/her contact list. You shouldn't be able to see his/her complete profile (I think).

Thanks, so by the sounds of it I'm not blocked, it's just we're never online at the same time.