Don't switch to an iPhone if you don't want to lose all of your data. This is an extraordinarily bad piece of engineering, and I'm going to try and see if I can return the iPhone I just purchased. I've now spent several hours messing with network settings on my Pixel and trying to get this data transfer to complete. But even when I only try to transfer 500Mb of message history, the process takes 2-3hrs and ultimately fails. I'd be embarrassed to have my name on this app. 0/5 stars.