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Hello and welcome to BBB! There are a couple of things that could be going on.
First off, unless they change status to be invisible, they very well may just be checking their mail. Some users don't even realize they have chat available from the Yahoo Mail screens on the web.
I don't use a Blackberry, but the information pages show you can access both mail and messenger. So it's possible they are just checking email from the phone.
I have also seen cases where someone is actually offline, but the server is still showing them online. It's a lot less common but it does happen - especially if the person was locked up and didn't realize it.
If you just see the person come on for a few seconds then log off, their account could have been compromised and a remote computer is accessing it.
Hope this helps!
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