Are you trying to sign in with another BlackBerry ID?

You can sign in with only one BlackBerry ID on your BlackBerry device. You can't sign in with multiple IDs and other people can't sign in to their BlackBerry IDs on your device. If you want to sign out and then sign in with a different BlackBerry ID, you must delete all of the data from your device by doing a security wipe. If you do a security wipe of your device, all of your data will be lost. Before doing a security wipe, make sure that you have a complete backup of all of your data.

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