Hello, I want to port number from Vodafone prepaid to O2. I am assuming I can keep the same number? What is the benefit ? I see a lot of people switching from O2 to vodafone? am I being crazy switching from vodafone to o2? My main problem with vodafone is that it is expensive. in 10 euros it gives only 3 GB and vodafone network never comes in Ubahn trains in Berlin.
Edit o2_Bianca: Moved to English o2 Community mobile
Everyone has to decide for themselves where they feel most comfortable and where they think the offers fit best. 
There are probably a number of factors ...
You can usually always take your phone number with you when you change providers, no matter where you go, that’s true. There are appropriate options. You should take a look at the Vodafone website. There should be information on how you can easily take the number with you. The Vodafone customer hotline will help you too.
Hello
welcome to the community and thank you for your inquiry! 
As
Kind regards
Jessica 
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