How can my wife receive OTP codes from Thailand while she is abroad?

My wife’s works in Aus as long as her Thai sim as on and set to wifi calling, if turn off wifi calling no messages come through. Otp from scb and gsb both come through fine when have wifi calling enabled

If you enable roaming and connect to a UK network then your wife should receive all standard text messages.. whether they originate from Thailand or anywhere else.. which includes her bank OTP's.. it's completely irrelevant which country your wife (the handset) is in.. the only restriction is having the phone in 'plane mode' or having 'roaming' turned off.. but be aware that connecting to a UK network using the roaming function could incur a connection fee with the Thai network.. and she will usually be charged a premium rate for making calls or sending messages.. but if you only intend to turn it on to collect a text and then turn it off again and don't actively use the phone it should cost nothing.. i do this all the time when travelling overseas and have no problem receiving texts from my bank.. and this also applies in reverse.. meaning if you have an overseas bank account and an overseas sim in your phone and need to collect an OTP whilst in Thailand.

Ps. The Thai bank doesn't need to use the international code at all.. their system does not differentiate based upon geo-location.. it assumes the receiver will be connected to a Thai network of course.. and when you 'roam' you are bridging networks to your home network.. the originator of the SMS is unaware of this and has no control over your ability to receive the message.. which is controlled by your phone's tech and your home network's ability to connect to an overseas network.. so whilst your Thai provider's system knows you are roaming and can identify your geo-location.. this information is not conveyed to your bank!

Even though it's a Thai number it would still need to have the international country code prefixed for anyone in Thailand to call or message the number. As the banks only facilitate in-country Thai numbers it won't work. Only option is the send someone into bank.

I have had the same issue. Roaming didn't help as the number isn't formatted with the international code in my banking app.