Originally Posted by
bdnyc
Do these retailers have a shop at the airport - or is shopping at the airport never a good idea?
As stated above, T-Mobile has a shop in the TXL (Berlin - Tegel) main shopping area. It's a company-owned store, not just a general "authorized dealer", so the price for a SIM is the same as if you were to buy it at a T-Mobile shop in the center city.