<index> Integer type, in the range of location numbers of phone book memory. If <index> is not
given, the first free entry will be used. If <index> is given as the only parameter, the
phonebook entry specified by <location> is deleted
<nlength> Integer type, indicates the maximum length of field <number>
<tlength> Integer type, indicates the maximum length of field <text>
<number> Phone number
<type> Type of address of octet in integer format (Refer to 3GPP TS 24.008, subclause
10.5.4.7 for details). Usually, it has three kinds of values:
129 Unknown type
145 International type (contains the character "+")
161 National type
<text> String type field of maximum length <tlength> in current TE character set specified by
+CSCS