Cant send SMS txt messages

[Tomhouston]

For around a month i havent been able to send sms messages.

i can recieve messages, ive tried switching off and on, tried airplane mode but nothing works.

im on a monthly plan.

phone is an iphone 15 pro.  I have 2 sims a physical sim for work (works fine) and a Three esim which is fine for data and calls but wont send sms.  

starting to get more than irritating. People txt me and I cant reply.  Very frustrating.

any ideas?

[jr0]

hmmm have you had any recent ios upgrade? or have you ever subscribed to a watch plan?

What error do you get, or what do you see when you are trying to send the sms?