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BlackBerry® OS Smartphones

New Contributor
Posts: 3
Registered: ‎04-29-2012
My Device: Blackberry 9300
My Carrier: T-Mobile

Basically everything

Hi, my pones bbm suddenly stopped working yesterday and so I decided to downgrade it to an earlier version, that still didn't work so I upgraded it again, I got my whatsapp to work but my bbm still doesn't work properly, also when I try do something on the app world I get the message No Cached Credentials - error ID 40721 come up as I was going to try re-download bbm but that message came up so I couldn't do anything.

Is there anything anyone can do to help me? Much appreciated Smiley Happy

Posts: 3,246
Registered: ‎07-26-2010
My Device: BlackBerry Z10
My Carrier: Bell

Re: Basically everything

Hello Hannah-Louisee1 and welcome to the BlackBerry® Support Community Forums.


Have you made any recent changes to your BlackBerry® Internet Service data plan?


When you go to send a BBM™ do you get a red X? 


If you could send me a private message with your PIN I can investigate further.


As for the BlackBerry App World™ error, this might be happening with a change to your data plan. If you connect to Wi-Fi then try to access App World again, do you get this same error?





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