Tips-&-Tricks.md

@@ -97,13 +97,18 @@ The proper way to 'get' and 'set' per-connection settings, if wanting to do from
 
 ## Modem Manager
 To get modem information:
-Firstly, `mmcli -L`
+* Firstly, `mmcli -L`
 to list the modems. For example, gives: /org/freedesktop/ModemManager1/Modem/**1**
 So the modem index to use at this moment in time is ‘1’.
-Then, `mmcli -m 1`
-You can check, in passing, your own phone number (`| grep own:`) and get the SIM index (`| grep SIM`)
-The output for the SIM index looks like: SIM | dbus path: /org/freedesktop/ModemManager1/SIM/**1**
-So the SIM index is 1.
-Finally, `mmcli -i 1`
+* Then, `mmcli -m M` where M is replaced with the modem index.
+* You can check, in passing, your own phone number (`mmcli -m 1 | grep own:`) and get the SIM index (`mmcli -m 1 | grep SIM`)
+* You can also check what mobile network you are on with `mmcli -m 1 | grep operator`. The operator id comprises three digits for the Mobile Country Code (MCC) followed by two or three digits for the Mobile Network Code (MNC).
+* The output for the SIM index looks like: SIM | dbus path: /org/freedesktop/ModemManager1/SIM/**1** - so the SIM index is 1.
+* Finally, `mmcli -i S` where S is replaced with the SIM index.
 That will show you your IMSI, among other pieces of information.
-`-i` and `-m` are abbreviated forms of `--sim` and `--modem` respectively.
+* `-i` and `-m` are abbreviated forms of `--sim` and `--modem` respectively.
+
+## Mobile Country Reference Data
+
+* Reference data for APNs (used to access the internet on the mobile network) is stored in the directory `/usr/share/mobile-broadband-provider-info`
+* Reference data for international dialling is stored in the locale file, in the LC_TELEPHONE section e.g. /usr/share/i18n/locales/ll_CC where ll is the language code and CC is the country code.
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