How CyanogenMod10 figures out caller's location?

Question

Edit: Changed JellyBean to cyanogenmod 10 as it's probably a cyanogen feature

I noticed my phone under CyanogenMod10 phone displays in the call log the (approximate) location of callers (only when the number is a land line phone not in my contacts).

It doesn't just rely on the country code because it also displays the city of the caller when found. I browsed the Contacts package app and found values was fetched from database (in com.android.contacts.CallDetailActivity)

final String countryIso = callCursor.getString(COUNTRY_ISO_COLUMN_INDEX);
final String geocode = callCursor.getString(GEOCODED_LOCATION_COLUMN_INDEX);

So I though it was in the Phone package app after successfully placing or receiving a call. But I quickly lost myself in the source... I would to know where and (briefly) how those values are set and the geocode resolved.

Are phone numbers sent to a mysterious web service?

Does Cyanogen have a table with all country codes and city prefixes of the world (I doubt it)?

Or is that DB downloaded depending on the country you are in?

MIUI Roms had this feature long before Jelly Bean, but they didn't resolved down to the City. — S.D., Nov 24 '12 at 14:23
actually i am using cyanogenmod10 I wondered before asking if it wasn't a Cyanogen feature instead :/ I dont have a google phone to compare, maybe i should edit my question... — MiniScalope, Nov 24 '12 at 15:02
Maybe its a Cyanogen feature. Use an app like [this](https://play.google.com/store/apps/details?id=com.eolwral.osmonitor) to pin down if telephony service or contacts app connects to any server for location details. — S.D., Nov 24 '12 at 15:14

score 2 · Accepted Answer · answered Mar 28 '13 at 14:55

Finally I found how this thing work

First ContactsProvider add this value when calling DefaultCallLogInsertionHelper.addComputedValues

see here

https://github.com/CyanogenMod/android_packages_providers_ContactsProvider/blob/ics/src/com/android/providers/contacts/DefaultCallLogInsertionHelper.java#L59

@Override
public void addComputedValues(ContentValues values) {
    // Insert the current country code, so we know the country the number belongs to.
    String countryIso = getCurrentCountryIso();
    values.put(Calls.COUNTRY_ISO, countryIso);
    // Insert the geocoded location, so that we do not need to compute it on the fly.
    values.put(Calls.GEOCODED_LOCATION,
            getGeocodedLocationFor(values.getAsString(Calls.NUMBER), countryIso));
}

so code you see

final String countryIso = callCursor.getString(COUNTRY_ISO_COLUMN_INDEX);
final String geocode = callCursor.getString(GEOCODED_LOCATION_COLUMN_INDEX);

is actually reading from saved data

So, real data are from PhoneNumberOfflineGeocoder which you can find here https://github.com/CyanogenMod/android_external_libphonenumber/blob/ics/java/src/com/android/i18n/phonenumbers/geocoding/PhoneNumberOfflineGeocoder.java

That is something called libphonenumber

https://code.google.com/p/libphonenumber/

Great!! Everyone seems to care of Privacy but no one spotted this feature as potentially intrusive. Thank you :) — MiniScalope, Jul 18 '13 at 11:34

How CyanogenMod10 figures out caller's location?

1 Answers1