I've been trying to text my friend in the UK repeatedly for a couple weeks, to no avail. He can send me text messages without a problem, but everytime I send an SMS message it reads as having been sent, but he never receives them. I've already done the activation thing, and I know I have the correct format in my address book (011 44 and then the 10 digit number) for the partner network (Orange). Does anyone know what the problem could be, or how to fix this? I have a lot of contacts in the UK and not being able to text over there almost defeats the purpose of having a mobile over here.

Thanks.