Finally, it doesn’t matter which bank you are with, it is crucial that you have the app on your phone.
This helps to track spending, but it is also extremely safe. There are a number of travellers that have their bank cards copied whilst abroad and become a victim of fraud. For example, once in San Francisco, I went on my mobile banking to find I had been hacked and someone had spent over £1000 of my savings on video games. Luckily, I had the app and managed to get all my money back in the same day.
Therefore, this one is vital, else you will be back home much sooner and poorer than expected.