Currently, snatch theft of mobile phones is at a high, especially from tourists wandering about with phone in hand. Then we have data theft to contend with and not only from open wifi, but now from oublic USB charge points. All is not lost if one prepares and stays alert, plus only use a phone when you need to! Back to browsing a paper map perhaps? The following article is a very detailed outline of what you can do to protect your device.