If you have sync enabled (which you should be by default) and your Kindle Whispernet is on, the iPhone will sync to where you left off. If your Whispernet is off, the iPhone will either sync to where you were the last time Whispernet was turned on, or start you at the beginning of the book (if it's been a long time since you've used Whispernet).
When you get home turn on your Kindle Whispernet and it will sync to where the iPhone left off.
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