Hi and Welcome to the Community!
BIS is no longer required for email functionality, though there is some debate as to if BBM requires BIS or not (I think not, and that BIS is entirely eliminated, but the carrier must still provision things correctly for BBM to function). BlackBerry has implemented ActiveSync for email, and it no longer uses BIS as the interface between the email server and the device. The device no directly interacts with the email server via ActiveSync. I do not know what security exists...I believe that if you have BES, higher security may well be usable (likely server set, and requiring BES10).
In some cases, it has actually been reported that leaving BIS attached to an account when shifting to a BB10 device actually prevents many functions...requiring the carrier to remove BIS from the account, which allows the BB to then function correctly. I do not know if this is the case with your specific carrier or not.
In general, all that is required is a generic data plan...but you must ask your carrier for anything specific.
Good luck!
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