No need to change the vo number. You plug it in, make sure you have the Bluetooth antenna connected as well and you should be good to go.
You need to program it in your vo only if for some reason you get the module reset/code with NCS. If you do that then it will remove the Bluetooth from it.
I have installed two modules on my two X5s. In one I did modify the vo but on the second one that didn't even have the antenna or mic installed I didn't modify the vo and it works as it should.
The quality for these TCUs is inferior comparing with the new aftermarket Bluetooth available but good enough I guess.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold