It's a running gag that every time somebody wants to use his mobile phone it's hard to get connected. This was a fact here in Groningen about ten years ago, but nowadays even Groningen is connected 24/7.
Because most of the series was filmed in the province of Groningen (specifically around the town of Overschild), the first two episodes had a special red carpet premiere on Sunday September 21st 2014 in De Oosterpoort, a theatre in the city of Groningen.
As Groningen City being just a square mile in this vast piece of land in the Top of Holland, it's just a small token of respect of the country side to celebrate in "the city".