TOF (Telecom operators filtering)

The AT@TOF command is used to customize the telecom operators filtering.

Example:
AT@TOF=gl601###,1,46001|46003,,,,012F$
+ACK:TOF,123456789012345,C031,10,0,,012F,20210407101530,1234$
AT@TOF?gl601###,,0C37$
+QRY:TOF,123456789012345,C031,10,0,1,1,1,46001|46003,,,,0C37,20210407101530,1234$

Parts	Fields	Length (Byte)	Range/Format	Default
Head	Header	3	AT@	AT@
	Command Word	3	TOF	TOF
	Leading Symbol	1	=	=
	Password	8-16		gl601###
Body	Mode	1	0-4	0
	PLMN Allowlist	N	PLMN1|PLMN2|PLMN3…
	PLMN Blocklist	N	PLMN1|PLMN2|PLMN3…
	Reserved	0
	Reserved	0
Tail	Sequence Number	4	0000-FFFF (‘0’-‘9’, ‘A’-‘F’)
	Tail	1	$	$

• Mode

  Specify the working mode of filtering the telecom operators.

  • 0 - Disable. Allow the terminal to register to any cellular network.

  • 1 - Allowlist only. The terminal is only allowed to register to the cellular network of the telecom operators which in the allowlist.

  • 2 - Allowlist first. The terminal is allowed to register to any cellular network, but the telecom operators in the allowlist are preferred.

  • 3 - Blocklist only. The terminal is only allowed to register to the cellular network of the telecom operators which are not in the blocklist.

  • 4 - Both allowlist and blocklist. The order of terminal filtering telecom operators is: ‘PLMN Allowlist’, ‘PLMN Blocklist’, others.

• PLMN Allowlist

  Specify the PLMN(s) as telecom operators allowlist. The terminal supports setting up to 10 operators (i.e. PLMN). The characters ‘|’ are used to connect each PLMN. Each PLMN is represented by 5 or 6 digits, the first three digits represent MCC, and the remaining digits represent MNC.

  For example, “46000” means PLMN 46000, and “46000|46001” means PLMN 46000 and PLMN 46001.

  In particular, the wildcard “FF” or “FFF” (Note that ‘F’ is a capital letter) can be used to match all MNCs in the country, that is, the format can be “MCCFF” or “MCCFFF” (where MCC is the specific mobile country code). For example, “460FF” covers the telecom operators all across China.

• PLMN Blocklist

  Specify the PLMN(s) as telecom operators blocklist. The terminal supports setting up to 10 operators (i.e, PLMN). The characters ‘|’ are used to connect each PLMN. Each PLMN is represented by 5 or 6 digits, the first three digits represent MCC, and the remaining digits represent MNC.

  For example, “46000” means PLMN 46000, and “46000|46001” means PLMN 46000 and PLMN 46001.

  In particular, the wildcard “FF” or “FFF” (Note that ‘F’ is a capital letter) can be used to match all MNCs in the country, that is, the format can be “MCCFF” or “MCCFFF” (where MCC is the specific mobile country code). For example, “460FF” covers the telecom operators all across China.