I was shocked just how slow and poor the mobile networks were in Germany. When I last visited (circa 2014) I literally switched my prepaid sim from T-Mobile to Vodaphone because the experience was so bad - only to have the same bad experience. I had barely usable LTE and connections dropped to EDGE on the train between Hamburg and Berlin. Google Maps barely loaded in the cities let alone the fact I was playing Ingress at the time and it was pretty much unusable

This was surprising to my Canadian sensibilities. Our mobile networks are expensive, but I generally get solid 4G and now 5G coverage between Toronto and Montreal and had full 4G (at the time) coverage on a road trip between Saskatoon and Calgary.