On my smartphone I have two bank apps. I wish to change my phone. Do I have to go to my banks with my phones to get staff to change them? Or can I just take my new phone to my banks and get the staff to put in a new app?

Assuming they are Thai banks you download the apps and simply register through your phones mobile data....wifi will not work....that was the info I was given a few months back 👍

I did just this last Saturday at Kasikorn in Central, Khon Kaen.

 

Do take your passport with you.  Onto your new phone down load the app through your phone's service provider, eg DTAC, AIS, not through your home wifi.  You'll have to buy a days worth of internet access which cost me 19 baht.

 

I took both phones into the bank.  Effectively what they do is to cancel the old one, then enrol you in the new one.  You'll be taken to the ATM where the assistant will set it up and ask you to input the PIN number, twice.  I used the same PIN as the old app and it didn't complain.

 

Overall took maybe ten minutes.

I did this earlier this year. I could install/activate the Kasikorn app myself at home. The Krunhthai Next app was different. After I installed the Next app, I had to visit the bank to get them to activate my account in the Next app. Both had to be activated using the same sim card that was used for the initial registration.