Bridgewalker is an exchange rate adjusted Bitcoin wallet.
Your balance will automatically be adjusted upwards, if Bitcoin's exchange rate drops. Conversely, your balance is reduced if the exchange rate rises. The effect is, that your balance stays stable in respect to the counter currency - currently USD.
If you deposit $20 worth of bitcoins, Bridgewalker will ensure that you continue to have $20 worth of bitcoins, regardless of how the exchange rate develops.
Use Bitcoin as a digital payment mechanism, without worrying about its exchange rate!
Available for Android devices
site link: https://www.bridgewalkerapp.com/
Choose carefully any service that store and manage funds for you. Very few Bitcoin businesses offer enough insurances to be used to store money securely like a bank at this point.