Unable to send sms

[Shelley83]

Hi, I have just got a sim only contract for my son who is having an old iPhone of mine (I selected I would be using an iPhone when getting the sim) he can send a message via iMessage to those who can receive them but is unable to send a message to anyone not with an iPhone. The setting for ‘send as sms’ is on but there is no option when you press the red ! next to a failed message to ‘send as sms’ which I have on mine. I’ve cross checked all his settings with mine and they are set up the same and I don’t understand why he can only send a text as an iMessage? Anyone know? 

[MI5]

@Shelley83 

See help here http://service.o2.co.uk/IQ/srvs/cgi-bin/webcgi.exe?New,KB=Companion,question=ref(user):str(Mobile),C... particularly the message centre number which for a contract sim should be +447802000332.

[Shelley83]

Thank you, I tried all this earlier but it’s still not working. I think I will have to call tomorrow

[MI5]

Can you send an sms to the same number and are all non iPhone numbers the same?

[Marjo]

Good morning @Shelley83 , as it's been a couple of days, it would be great to hear how you're getting on with this - is your son able to send SMS now or still experiencing issues with it?

Cheers for the troubleshooting, @MI5  

[Shelley83]

No, I’m going to phone O2 tonight when I get home from work. I can’t work it out at all.