If I bought a Japanese iPhone 6, would it be compatible with European GSM networks, including LTE? I heard that Japanese phones, like US phones, are very restricted with regards to carrier network compatibility.
Apple sells an unlocked version here. I've used it with local carriers in a few other Asian countries so far but not the EU yet. But I imagine it'd work fine.
If I bought a Japanese iPhone 6, would it be compatible with European GSM networks, including LTE? I heard that Japanese phones, like US phones, are very restricted with regards to carrier network compatibility.
All iPhone 6/6+ variants have common LTE bands of 1,2,3,4,5,7,8,13,17,18,19,20,25,26,28 and 29.
The Sprint/European/Asia-Pacific variant includes 4 extra TDD-LTE bands (38,39,40,41).
Note that Sprint models bought from the US may have issues with unlocking (from what I've read in other threads in the forum).
Back in the days of the 5s/5c/5, the Japanese variants were different from the worldwide variants. That is no longer the case with the iPhone 6/6+ according to apple.com/iphone/lte