Or one has to pay for Realm thingy? There were some updates lately so things may have improved with platform compatibility.
I've bought Xbox360 before, and now it seems I need to pay 20 euro to get Xbox One version, but it does not make much sense if I cannot play with PE over LAN.
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Hm, now reading xbox help http://support.xbox.com/en-US/legacy-devices/windows-phone-8/minecraft-pocket-edition-on-mobile-devices-help and it says
Quite disappointing...