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We have a large number of Vodafone sims in roadsite meters (they count cars and phone home with the data).
The meters have been assigned IP addresses in the 195.233.151.xxx range. When you look this up the geo location is Germany. Our firewalls are clever and blocks non UK IP addresses using their Geo location. So our meters that are definatly in the UK but have a German geo location were blocked. I had to allow all German IPs to make them work.
What is the network and subnet mask that Vodafone are using? I want to add that network to our allow list and remove Germany. I tried calling Vodafone support, guess how that went? That guy in India didn't have a clue about networking.