I'm using an iPhone 3GS with XT and txt messages have been messing up when I txt another person.
I think this only happens when the txt message I send exceeds 1 page/120 characters/or however many can go in 1 txt.
Nothing goes wrong on my phone, but the person I txt to, receives some of my txt (1st page I think) and then it cuts off, and a random txt from days/weeks/months ago suddenly adds on to the message!
For example,
I write to you day 1: Hello how are you my name is Emil the weather is wonderful.
You get the full message perfectly.
I write to you day 2: I'll pick you up at 7:30 and we can leave to Hawaii.
But you receive: "I'll pick up up at 7:3he weather is wonderful!"