Motorola G24 用户手册

The Set command can force an attempt to 
select and register a specific GSM network 
operator. The <mode> selects whether this is 
done automatically by the G24, or whether 
the selection is forced to an operator <oper> 
(given in format <format>). If the selected 
operator is not available, no other operator is 
selected (except when the <mode> is set to 4).
<mode>=2 forces an attempt to deregister 
from the network. 
<mode>=3 sets the operator format to all 
further Read commands (+COPS?) as well.
The selected mode applies to future network 
registrations, for example, once you 
deregister from the network, the G24 remains 
unregistered until you select <mode>=0, 
<mode>=1, or <mode>=4

The Read command returns the current mode 
and the currently selected operator.

The Test command returns a list of 
quadruplets, each representing an operator 
present in the network. A quadruplet consists 
of an integer indicating the availability of the 
operator <stat>, long and short alphanumeric 
format of the name of the operator, and 
numeric format representation of the operator. 
If any of the formats are unavailable, there is 
an empty field. 
After the operator list, the G24 returns lists of 
the supported <mode>s and <format>s. These 
lists are separated from the operator list by 
two commas.