Hi and Welcome to the Community!
Apologies for the delayed reply...hopefully you already have resolved this, but just in case...
There are many services that are proprietary to BBs alone, and many still that require an active BB-level data plan, from your carrier, in order to function. Email is one of those, so I am confused that you say you could use email when your credit had expired...but, no matter...it's also possible that they (your carrier) didn't "catch" you immediately and allowed the service to continue even after the credit has expired (such happens all the time).
It's also impossible to tell you exactly what services should and should not work in your specific circumstance. There are hundreds of carriers in the world, each with dozens of different BB data plan levels...each carrier sets what exact services the user can have based on the specific data plan subscribed to.
From what I understand, WhatsApp requires a proper BB data plan, so the fact that it may have functioned for a bit may as well be a matter of them not immediately "catching" you and shutting it off right when your credit expired.
Further, it sounds as if your carrier adjusted the plan on that SIM and removed all BB services from it so that it would work correctly with your Samsung. In which case, your carrier would again need to adjust the assigned services to re-enable BB-level services onto that account.
Good luck and let us know!
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