This question is definitely a complicated one. My Best friend is in the US army and is stationed in UK. He has a o2 UK mobile phone. He ended up coming back on leave and is back in the US for a few weeks. I cant send any text messages to him, i can only receive them from him. While he is here he is roaming on the Cingular Network. I have put in the 011 plus the 44 for the country code with his number and it says that the message is sent but he never receives it. Can anyone help or give me any info to why it does not work. I looked on Sprint's website and it tells me that they have a text messaging agreement internationally so it should work. Any info or help will be greatly appreciated. Thanks. 😁