DUPING ITEMS (CHEAT):
You can duplicate (cheat) items in the mobile version.
Put any item in the Caravan. Close the caravan window.
Open the Options window. Click SAVE GAME.
Open the caravan window. Move the item from the caravan to your character's bag/inventory, then immediately force close the app or restart your phone.
When you reload your character, the items should be both in the caravan and in your bag.
This is obviously cheating, and can make the game less fun if overly abused. I mostly avoid duping any gear, but I do use the dupe for two specific purposes: First, when I want to make an artifact, I dupe the formula first. I've had to farm Jade Idol half a dozen times in the past when I'm making higher level artifacts and it always takes hours. So now I just make sure I keep one of each formula in the caravan. Second, I use duping to make Experience potions. If you gamble Orbs from the guy in Atlantis, he occasionally will give you a 100% Experience potion that lasts 30 minutes. It's 5 million gold for a Legendary orb, and I get an XP potion once every 30-40 orbs or so. So, I duped one potion several times to get 64 potions (1 dupes to 2, 2 to 4, 4 to 8, 8 to 16, 16 to 32, 32 to 64). Now, when I start a new character, I play without XP potions until I beat legendary (usually around level 65), then I use XP potions whenever I farm, since the time to level from 70-85 is absolutely nuts.