Can it get hacked?
I would actually say yes it can get hacked. It’s very easy to hack online banks.
If the phone gets missing, can you block the account?
No, if your phone gets missing and you’re using an online bank it will be easily hacked or they can easily take all your money while other banks, if you’re phone or ATM card gets missing you can go to their office and lay a complain and they will close down the account or card.
In my opinion for now in naija online bank are the best, they are better than all this bank you mention, many people have being doubting this online bank that if their money get missing, how they go take complain say their money don miss, since i start to dey use this online bank i never see any body complain say their money get missing, except they no hide their informations there's someone that have access to their account, since i start to they use this online bank over 2 years, nothing have ever happen to my money except my transaction go dey pending, when is 24 hours dey will refund it back, so for what reason i will still be using all this bank that if anything happen to my money they will just be stressing me to bring this and that, they will know that the money will not be refunded again, yet they will still be stressing you.
All this people wey no believe on this online bank na their problems, my family member anybody that has bank account, na online bank we dey use now, with ATM as you said that what if our phone and the ATM get missing how can we take get access to our bank and pack the or block the account? If you no trust anybody in your family don't let anyone to know your transaction pin, if phone get missing which the person want to get access into your mobile app, like Opay they will ask for kyc which is face verification, if the face no look alike with the owner of the account, there's no way the person will get access into your account and pack your money.