DangerRuss

I remember, when I went to the bank to explain loosing access to tge k app, i saw the bank manager open the app and use a backdoor feature.  She then looked at her badge ID # and she then inputted her credentials and after a couple seconds the phone buzzed and a text arrived.  She did a bunch more inputs and log-ins and eventually we had access again.  

21 minutes ago, damole said:

Thanks for the link to the other thread.  t does seems you need to be using mobile data from a Thai SIM and possibly the Thai SIM with the number that is registered although that is not clear.

 

I did try a VPN but maybe not with my Thai SIM in the phone.  I don't know of any one day roaming packages.

 

My main Thai number is DTAC, this is the one that is linked to my bank account.  I do have a True H SIM which is in my tab and used for my TrueID sports subscription.

 

I think I will just try installing it whilst at the bag carousel.  DTAC are givng me 24 hrs free mobile data for being an old customer (20 years this year).

 

 I will ask customer service once I am back and hope to get a definitive answer.

I too had DTac sim card.  That isn’t the problem.  
 

i bought a new iphone last year in the states and downloaded tge k-app and it wouldn’t work on tge bew phone.  So, i tried to go back to tge old phone, but aftertrying on the new phone, the k app blocked me until i was able to return back to thailand.  I currently using my Verizon usa sim and works fine with my k app on the mobile.  It’s not about tge sim…it’s more to do with the original k app that is registered and usable on the phone that was given permission to log in.  Once you switch phones…if you try and switch phones without the assistance from a k bank rep…you will be locked-out until you can return back yo Thailand 

I too have a K-bank account and can state emphatically that when you switch/have a new phone, you must register and sign onto the new acct/new phone by doing so at the K- Branch the first time you want to use a new device.  
 

I too tried everything that everyone listed in the comments, those don’t work.  You must do so at a K branch/bank.