method of payment. It's so convenient and fast, and hassle-free. You also have a lower risk of theft / loss when you travel abroad and you have no safe way to store your currency.
I would rather walk around with a mobile phone and draw little attention to myself, than carrying a wad of cash and painting a target on my back to all pick pockets out there.
I really hope your mobile phone never get stolen (or lost) otherwise you lost also your valued BTC wallet. Here, a lot of mobiles are reported as stolen by tourists. Probably if use draw out an iPhone, the last Samsung Galaxy or any other valued smartphone, you're still painting a target on your back to all thiefs & scumbags in the neighborough.
You do not have to keep your whole stash on your mobile wallet. You could re-charge it from any online wallet provider not connected to your wallet.
I never keep more than 25% of my whole stash online anyways... it's safely tucked away on paper wallets and cold storage.
It's just a extra option, if you become a victim of theft {You could easily replace a phone or use your partners phone and continue as normal} It also buy you some time to
sweep the address connected to your phone, before they figured it out.