Of course you do not expect to keep the password worth millions for mobile wallet applications but keeping a few thousand will not hurt as it's safe depending on your level of security from both the app and yourself for your phone. I have chosen 2 security modes to protect my BTC more. It would be quite reasonable and predicted that Samsung would be the first company to develop a smartphone with built-in electronic money storage wallet it would be nothing great. How are Samsung related to making such claims? However, I think that portable wallets can be quite safe to hold coins. There are many factors that affect the security of coins on your cell phone. If there can be a means to restore it in such circumstances then no doubt it is the best way to store electronic money.