
Chapter 19: Wireless Wide-Area Networking
Data Coding Schemes for Phone Book Entries
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Psion Mobile Devices Developers Guide
Writing Phone Book Entries
To create a new phone book entry:
• Use the AddPhonebookEntry method for the selected Phonebook object. A PhonebookEntry object
representing the new phone book entry is returned.
Volatile
A phone book is volatile if its content can change at any time. Modems change this type of phone book, as
well as the Mobile Devices SDK. Dialled Calls, Received Calls, and Missed Calls phone books are volatile;
however, Regular, Service Numbers, Own Numbers, and Voicemail Access Number phone books are never
volatile. If you want to make sure that you never miss a change in a volatile phone book, then you must
re-read them whenever a call is disconnected.
Writable/Modifiable
Depending on the types of entries stored in a phone book, it may be writable or it may be read-only. See
Section 19.14.2 Phone Book Types on page 227 for more information.
19.14.1 Data Coding Schemes for Phone Book Entries
The data coding scheme for a phone book entry determines how many characters can be stored in the
entry. For example, you can store approximately twice as many characters using an 8-bit alphabet as you
can with a 16-bit alphabet.
A phone book can contain entries that use different alphabets.
The following alphabets can be used to store phone book entries:
•SMS Default
•SMS GSM 7-bit
•SMS ASCII 8-bit
• SMS Unicode 16-bit
•SMS Binary 8-bit
• SMS GSM PDU
Unicode entries must be stored in a 16-bit alphabet.
SIM cards can only store entries in SMS GSM 7-bit and SMS Unicode 16-bit.
The SMS Default uses the driver default algorithm for selecting the alphabet for an entry. The driver exam-
ines the characters used in the name, and the driver selects the alphabet that stores the maximum number
of characters in the space available for the entry.
19.14.2 Phone Book Types
A SIM card or WWAN modem usually has several phone books stored on it, each containing a specific type
of phone number. Each SIM or modem has a subset of the possible phone books. The following phone books
types are identified and processed by the Mobile Devices SDK:
}
}
}
}
if (number_combo.Items.Count > 0)
{
number_combo.SelectedIndex = 0;
}
Phone Book Typ e Description
Regular Writable Features depend on the SIM or the modem.
Services Not writable Network provider numbers such as numbers for technical assistance.
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