The SIM card that is in the Serene is the same one used with the Motorola and the Nokia. With those phones the access was fine and Text messages were sent seamlessly from the USA with both phones. I think it is more than ironic that one phone, the Motorola, that was a free gift for collecting Coka Cola labels, and the Nokia that cost nothing with a plan both worked without any effort, wheras the Serene, that cost nearly $2000AU!!! either won't work at all, or you have to manually change bands in order to get it to work! It really shows that there is no necessarily any relationship between price, quality and value!
I love my B&O equipment but perhaps it really is true that designer labels do not necessarily equate with quality!