Can't send text to a certain number

Hi
I'm getting really frustrated, so I hope someone can help.
Since yesterday, I have not been able to send a text message to a certain person in my address book.  (Not sure how relevant it is, but she has an android phone).  The message states it's sending, gets right to near the end, then fails, and the red exclamation mark pops up.
I've had a look around the net and have already tried the following:
Added the country code to the number
removed the country code
Removed the person from my contacts and re added them
turned the phone on and off countless times
reset all settings
... even took the sim card and gave it a dust.
She can text me, but I can't reply.   It worked fine on Saturday.   I have been having this problem intermittently with others, but usually on the 2nd or 3rd attemp the text goes through ... but no joy this time, and I think it only with her (don't really want to text all my contacts to test this theory, but I'm able to send to others ... hmm they are on Iphones tho ..)
Can anyone help, or even suggest if this is an  Apple or Carrier (O2) problem?
Thanks so much
Lesley

I have the same problem - after upgrading to ios 6.1 can't text my son all of a sudden, everyone else on my contact list is fine.  Nothing to do with phone provider as it worked fine before.  Please can anyone help?

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