iPhone cannot change SMS message center since iOS 12

[andrew89898]

Hi, I bought an iPhone 6S Plus back in Dec 2016, I received a O2 sim with it, I think it was a Pay Monthly sim. I am a Pay-as you go customer and if I remember correctly it all activated, I have service, 4G internet and calling. But the text messages did not work because the sim has the pay monthly message center number, at the time I found that you can manually set it using the keypad and a specific command, so I saved that to my notes and used that every time my device restarted.

I think Apple have stopped this from working in iOS 12, so I cannot fix my text messages. 

Is there a way to fix this? I'm assuming other users have had the problem. 

I guess I could request a new PAYG micro SIM for it but I want to keep my number and everything... If it comes to it I would also consider moving to a SIM-only plan.

Thanks.

[MI5 · Accepted solution]

@andrew89898 

Simply pop in to your local O2 shop and ask for a PAYG SIM.

They will transfer across your number whilst in store.

[jonsie]

A new sim is the only way to stop this happening. As advised by @MI5 , instore every time. They will change everything over normally within an hour.

[EmilieT]

Good morning @andrew89898, how are you getting on with your iPhone? Did you get a chance to try the suggestions above yet? 

[andrew89898]

Sorry for late response - yes I went to my local O2 shop and had my sim swapped, worked out fine. Thanks for the help.

[EmilieT]

Great to hear @andrew89898, thanks for coming back and letting us know!