There's a Lidl store right next to the Frankfurt airport. You can buy a Fonic card and top-up cards over there...

Langer Kornweg 14-16, 65451 Kelsterbach - Google Maps

How is 'O2' pronounced?
 

Since this thread has O@ in its name: How is 'O2' pronounced in UK and Europe? I kept hearing in the news last week "Oh-two Arena".
Is it pronounced 'Oxygen'?

thanks

Oxygen would be good! I thought that is what they would call it too! Unfortunately in UK at least it is "Oh-two". I think in Germany it is "oh-zwei" most of the time.

o2 is owned by Telefonica so here it is just called "Movistar".

@VladS
There is a distance of 5 km between the airport and that Lidl store.

@petkow
In Germany it's also pronounced in the English way. Even in commercials they say "oh two" - never heard someone to germanize it to "oh zwei".

Where I live 5km is 'right next to...'. I might have made the wrong assumption that our fellow forum member was going to rent a car.

Ehm...not exactly...
I'll be on a school trip, and I won't be able to go wherever I want...unfortunately! :D

Thanks for the advices anyway, I hope I'll be able to find a blauworld or Fonic sim card at least during one of those 6 days!

You're always precious. :)

He wrote he would spend 5 hours at FRA, so I guess he wants just a SIM to call home during his short stay.

Actually, 5 hours in Frankfurt, and 6 days in Berlin. :)

I actually think there is a Bus which goes from the airport to Kelsterbach. I used to know someone who lived in Schwanheim which was 5mins away from the airport by bus. That is close to Kelsterbach. However, the bus is not that frequent.

Rather than going to Lidl, if you have 5 hours in FRA, hop on a S-Bahn (metro) from the basement of the airport and you can be in the centre (at Hauptbahnhof or Hauptwache) in a little more than 10 mins. Plenty of options around there for picking up various SIM's. Other than that, there will be plenty of options in Berlin.

Thanks to Inquisitor too about the pronounciation of o2 auf Deutsch! ;)

I really thank all of you, guys! At least, whenever and wherever I'll find a reseller, I'll know what to buy! ^^