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Keep getting a "could not send" message when trying to reply to a text. Texts yesterday were a bit erratic. Some gave this meeage and then sent on a further try, others delayed by several minutes. One arrived about 2 hours later (after a second message sent. One reply just won't senf at all. Never had problems like this until the update of the phone. Might be coincidence?
Either your SIM card its acting up or you have network coverage issues or an app its acting up, yo ucould repair your phone or you could get a new SIM card
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget the Kudos
I have one person with whom I talk to all the time on text message. All of a sudden the other day I sent a text and it wont go though, I keep getting "Could not send"
How do I fix that? I seem to be having no problem with other text messages
Force turn off your device by pressing the little button from the back,below back cover.