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I am currently abroad in the EU for an undefined period of time due to the current Covid19 crisis.
My current contract is Unlimited Data Max since October/November (can't exactly remember).
Before that, I used to receive SMS for Multi-Factor Authentication with no problem, even when abroad with no data on.
After I switched to the Unlimited Data Max plan, I am unable to receive SMS whilst being abroad, whether in the EU, Asia or US.
I have checked my APN settings, and I set them up according to this: Vodafone Guide
Additionally, I am unable to use the chat as it says "Loading, please wait" indefinitely
Addendum: I am also able to make phone calls whilst being abroad, to the UK and to French numbers, but I can't receive SMS texts