Hi, pensioner here so please be gentle. I have a Samsung Galaxy A3 which like me is old but meets my needs. It's Android version 6.0.1 I have just received a message from my bank (Nationwide) saying that Android 5 & 6 users can't use their App from the end of Aug as it will no longer work. To continue to use the App I need to upgrade my operating system to Android 7 or above. Can my phone be upgraded or do I need a new one. Thanks