Volte and vowifi in Portugal (Vodafone)

Hi guys,
I've got a 8Gb 256 Zenfone 6 and I live in Portugal and exploring my phone, I dicovered that the phone doesn't have Volte and vowifi?
I want to know why the firmware doesn't have activated the Volte and vowifi in Portugal?
The build instaled in my phone is ww_17.1810.2003.145.
I would like to have a answer!
Best Regards
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