How to enable 3G roaming?

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi there, how can I enable 3G roaming on USB 3G modem (Huawei E3131s2)? On the phone I do it from menu, that makes me think that it is tied to device not SIM.
Something in /etc/config/network? Or series of AT commands to modem?

Router is TP-LINK MR-3220 with "old and unsupported" BB 14.07, but I don't think it plays any role in this question.

2

I think that is the only option, so nothing to do with OpenWrt.

3

Will reply to myself:
Found this: http://www.3g-modem-wiki.com/page/common+AT-commands page, it says:

System Config
^SYSCFG=mode, order, band, roaming, domain
Mode
2 Automatic search
13 2G ONLY
14 3G ONLY
16 No change
Order
0 Automatic search
1 2G first, then 3G
2 3G first, then 2G
3 No change
Band
80 GSM DCS systems
100 Extended GSM 900
200 Primary GSM 900
200000 GSM PCS
400000 WCDMA IMT 2000
3FFFFFFF Any band
40000000 No change of band
Roaming
0 Not supported
1 Roaming is supported
2 No change
Domain
0 CS_ONLY
1 PS_ONLY
2 CS_PS
3 ANY
4 No change

In case of my modem response is:

AT^SYSCFG?
^SYSCFG:2,2,3FFFFFFF,1,0
OK

So I think, I have roaming enabled.

"Hard" confirmation will be to test when my op BTS is down, it should roam to other op. (Play in Poland).

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