Basically, earlier today for some reason my Nexus S was refusing to send a text to a particular person, it just kept saying message not sent. In a stupid attempt to fix it, I googled for assistance and ended up changing the SMSC number or whatever it is and now I can't send a text to anyone. I've been searching around and got this site: Online PDU Encoder and Decoder | Open Source @ twit88.com where I convert the SMSC number. I was told you enter your phone carrier's SMSC (which is Orange for me) so I found that out to be: +447973100973 and there was an alternative +447973100974 according to SMS Text Messages - UK Information and Advice So, I put that in and converted and got this: AT+CMGW=24 079144973701904711000A9210299232900000AA0CC8F71D14969741F977FD07. Googling told me that it's the first sixteen numbers in the second line you enter in the SMSC bit on your phone, so I did that, pressed update and still none of my messages are sending. Have I got the carrier's SMSC number wrong? There's also a 'Receiver' box on that converting website but that already had the numbers 0192292309 in it. Tried everything I can but I'm at a loose end now and very frustrated. PLEASE can anyone shed some light and help me fix my phone? Thank you.