Hi- Having a little trouble with the SMS application in the UK. I've read the wiki topic and also the BT documentation SIN 413, which describes the service technically. I've been able to successfully send messages from my customer's ISDN landline to various mobiles, but cannot get the mobiles to be able to send messages back to the landline. I've tried sending from both Cellnet and Orange, with the result that the phone says "Message not Sent" or something similar. I've been using message centre subaddress "1" when I initiate messages, and assume that I should also reply to subaddress "1". For example, on the mobile, the message shows to be from "01234567890 1" (spaces added for readability) where "01234567890" is the number of my ISDN landline. When I reply from the mobile to this message, I try both the number with and without the "1" at the end, and get the same result both times. I'm missing something here I think. Do I have to register separately on my landline to receive SMS's? Doesn't sending a message automatically register me to receive them too? Thanks Scott Scott M. Stingel President, Emerging Voice Technology, Inc. Palo Alto California & London England www.evtmedia.com