Psion Inc 7505BTHC25 ユーザーズマニュアル

Tapping on New opens a dialog box for sending a new SMS message. The recipient's phone 
number (to be entered in the To field) can consist of the digits 0 through 9, as well as the * 
and # characters, optionally preceded by one + character, indicating an international number 
(i.e. the country code follows immediately after the + character).
By checking the Store message in Outbox field, a new message can be stored in the Outbox 
before being sent. If no storage space is available or the modem does not support the storage 
of outgoing messages, this checkbox is disabled.

Tapping on Inbox opens the list of received messages. Reading 50 messages, for example, 
from the SIM can take about 30 seconds. By default the list of messages is sorted with the