The network costs and commercial viability of Germany’s new mobile entrant, Drillisch 1&1, are even less visible than those of Dish (see separate item), since roll-out has scarcely started. The main known fact about 1&1’s strategy is that it will use the Open RAN platform and integration services from Rakuten’s integration arm, Symphony, but since the German player made that announcement about a year ago, it has provided almost no further information. This has prompted speculation that its parent, broadband provider United Internet, may be rethinking its decision to build a national 5G network in the spectrum it acquired at the last German auction. However, that would mean forfeiting the spectrum, since it came with a condition of installing at…