HTC ONE M9 Text Messages not working?

[Anonymous]

I seem to be having trouble sending text messages on my device, i just get the following
"Unable to send message after multiple attempts"

Is there a problem with O2 or is my phone knackered?

This isn't the first time its happened either..

[Bambino]

Check here to see if there is a problem in your area: http://status.o2.co.uk/

[Anonymous]

Thankyou Bambino, very useful link,  but it says there are no problems in the area at this time.

[MI5 · Accepted solution]

Check you text message centre number is correct.
An incorrect number suggests you have the wrong sim card.
http://www.o2.co.uk/help/phones-and-devices/text-message-settings

[Anonymous]

BRILLIANT The number was incorrect..Thanks so much

[MI5]

No worries, but you should now pop into an O2 shop and get the correct sim for your account type. Contract and PAYG are different, and each time you turn phone off and on it will reset to the number stored on the sim card.

[perksie]

Ahh wrong sim, that would do it.