Hello Markus,   
      
   Monday July 30 2018 22:37, I wrote to you:   
      
    MR>> I assume they didn't get sufficient IPv4 address space from ARIN   
    MR>> for the US market. So they were forced to go for IPv6.   
      
    MV> Arin depleted ger IPv4 stock in Sept 2015, so it is a reasonable   
    MV> assumption that T-mobile US can't get any more IPv4 address space. But   
    MV> the the same would apply to RIPE and the European obile providers.   
   [...]   
      
   Here are some interesting thoughts about why T-Mobile US went IPv6 and others   
   did not (yet).   
      
   https://preview.tinyurl.com/y7hjyjlf   
      
      
   Cheers, Michiel   
      
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    * Origin: he.net certified sage (2:280/5555)