DISCLAIMER | This isn't exactly the solution, but it's a sort of "it'll do" solution.
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The world was created on my iPhone, I want to play on my iPad, because bigger screen.
This is how I resolved the issue:
(1) Open world on 1st device
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Make sure the world is a "multiplayer host"
(gear icon, settings, multiplayer host, yes)
(2) Join the world from your 2nd device
(start-up screen, play, join game)
(3) Give all gear over to 2nd character
(4) Find a hiding-place for main character
• if you're on hardcore mode I recommend clearing out ALL your inventory (don't forget gold) because Wraiths will kill you through walls
(5) Disregard main account.
(of course, the app must remain open, so I recommend plugging main device up to a charger before disregarding it, if it dies the world will shut off in the middle of your playing)
(6) Play as long as you please with alt character.
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It's not full proof, odds are your main character will die many times from mobs + your second account probably does not have the amount of mana/health that account #1 has, but like I said: it's not 'the' solution. It's 'a' solution.