IPv4 mobile data connection not possible

This is pretty confusing. Have any of you any idea why some 10 IIIs work and others don’t?
I have my 10 III since August, 1st. Did the installation by the book, reimported my data from.my XA2, 4.4.0.68 with that softlink from./home/nemo to /home/defaultuser, put my Vodafone SIM in slot one, my SD in the other and left everything with default values.
SIM two is activated, network set to automatic

Exept from.sometimes taking a few seconds when switching from WiFi to mobile network everything works fine with.4G and no VoLTE.

I have a Vodafone prepaid SIM.

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