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...c 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 t...