Not getting some verification codes

[Pig-E-Wig]

Hi,  since moving over to o2 from sky and bringing my number, I can’t get certain verification codes, some work, some don’t. The number is correct and nothing is blocked in settings. This is causing me major issues as I can’t pass 2FA without receiving the text messages. These include bank apps, Apple Pay cards and social media accounts. Can anyone help? I’m on iPhone 11 Pro on latest iOS. 

[MI5]

@Pig-E-Wig 

It sometimes helps to turn off wifi before requesting a code.

[userpd]

I am having an issue with receiving activation codes from Natwest for the mobile app and also for Google's 2 step verification. Texts either don't arrive at all or arrive hours later when the activation code has timed out. Other texts arrive fine. It used to work ok when I was with Virgin mobile. Anyone else had this issue or a solution? 

[Debs68]

 @userpd Try Disabling Auto 5G and Putting it into 4G 🙂