A lot of questions on this one, so posting here to share and make aware and also safe keep an online consolidated reference for myself
Article Title: What is a wireless BlackBerry Device Software update
Article Number: KB15631
Link:
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Article Title: Requirements to perform wireless BlackBerry Device Software updates
Number: KB15626
Link:
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Remarks:
The wireless service provider determines the wireless BlackBerry Device Software updates that are available for BlackBerry smartphones and the date of availability for the updates. For information about support for wireless BlackBerry Device Software updates on a BlackBerry smartphone, contact the wireless service provider (e.g. Verizon wireless... etc).
Somebody consolidated a list of wireless service providers that support OTASL (aka Over The Air Software Loading) but I do not know if they are up-to-date:
Link:
OTASL - Official BES Provisioned Versions - Port3101.org : Your BES Connection