I got a Sim card in Berlin, but it will not let me message anywhere outside of Germany...

GetHuman-lordmoni's customer service issue with Vodafone (Germany) from August 2018

Help with my Vodafone (Germany) issue
The issue in GetHuman-lordmoni's own words
I got a Sim card in Berlin, but it will not let me message anywhere outside of Germany. I told the man we are going to Prague as well and that I need to text and use data there. I'm worried that the data will not work as well, and that I just wasted ** euros. I'm not sure what to do, and all the help lines I try are in German, which I don't speak. Sim: ************** is the barcode on the package.
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Vodafone (Germany)

Customer service issue
Reported by GetHuman-lordmoni
Aug 27th, 2018 - 3 mons ago
I have an issue with Vodafone (Germany) too
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Seen by 3 customers so far
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Timeline
GetHuman-lordmoni started working on this issue
Aug 27th 5:30am
GetHuman-lordmoni indicated the issue is not fixed yet.
Aug 27th 9:10am