3 defined values, 3 network registration +creg, 1 description – Rainbow Electronics 900 User Manual
Page 45: 3 network, Registration, Creg

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AT+COPS=0
Note : Ask for registration on home
network
OK
Note : Succeeded
AT+COPS=3,0
Note : Set <format> to long
alphanumeric
OK
Note: Succeeded
AT+COPS=2
Note : Ask for deregistration from
network
OK
Note : Succeeded
AT+COPS
+CME ERROR: 3
Note : not support
6.2.3 Defined
values
:
The parameters values are the following ones:
<mode>
0: automatic (default value)
1: manual
2: deregistration ; ME will be unregistered until <mode>=0 or 1 is selected.
3: set only <format> (for read command AT+COPS?)
4: manual / automatic (<oper> shall be present), if manual selection fails, automatic mode is entered.
<format>: format of <oper> field
0: long alphanumeric format <oper>
1: short alphanumeric format <oper>
2: numeric <oper> (default value)
<stat>: status of <oper>
0: unknown
1: available
2: current
3: forbidden
<oper>: operator identifier (MCC/MNC in numeric format only for operator selection)
The long alphanumeric format can be up to 16 characters long (see appendix 19.12 for operator names
description, field is “Name”)
The short alphanumeric format can be up to 8 characters long.
6.3 Network registration +CREG
6.3.1 Description
This command is used by the application to ascertain the registration status of the product.