How to use AT+CPLS

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modemseeker - 14 Jul 2007 06:27 GMT

Hello everyone,
I am new to this user group. I would like to know how to set a 3G
modem to manually select PLMN and then select a specific PLMN like say
011

So, there are 3 basic commands, at+cpol, at+copn and at+cpls.

So can someone help me or know of a document which gives examples on
how to use these commands and other AT commands?

Thanks

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John Henderson - 14 Jul 2007 09:03 GMT

> Hello everyone,
> I am new to this user group. I would like to know how to set a
[quoted text clipped - 5 lines]
> So can someone help me or know of a document which gives
> examples on how to use these commands and other AT commands?

"AT+COPS" is the command to select PLMN. A PLMN is 5 or 6
digits - a 3-digit MCC (country) followed by a MNC (network
within the country). In most countries, MNCs are 2-digit, with
North America being the notable exception (3 digits).

AT+COPS=1,1,<PLMN>

should restrict you to your desired PLMN when its value is
plugged into the command as the third argument.

"AT+CPOL" and "AT+CPLS" are concerned only with /preferred/
networks. They guide choice, other things being equal, but do
not offer any restriction. "AT+COPN" simply lists the PLMNs
and associated names configured into your device.

See technical spec 3GPP 27.007, which you can download from
www.etsi.org or www.3gpp.org.

John

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John Henderson - 14 Jul 2007 09:07 GMT

I wrote:

> AT+COPS=1,1,<PLMN>

AT+COPS=1,2,<PLMN>

Might work better.

John

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modemseeker - 15 Jul 2007 12:44 GMT

> I wrote:
> > AT+COPS=1,1,<PLMN>
[quoted text clipped - 4 lines]
>
> John

Thanks

I need to know the combination of AT commands to disable FDN. I used AT
+CLCK="FD",1

Thanks
Jami

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John Henderson - 15 Jul 2007 22:17 GMT

> I need to know the combination of AT commands to disable FDN.
> I used AT +CLCK="FD",1

I'm not sure what you're trying to achieve. If you've locked-in
the fixed-dialling phonebook with the above command, wouldn't
you just use

AT+CLCK="FD",0

to unlock it?

If you just want to select a particular phonebook like FDN,
couldn't you use the likes of

AT+CPBS="FD"

instead? Or do you have security issues with the modem in the
hands of a user?

John

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