How to modify emergency call list?

Hi everyone,
I'm from Italy and I'm using a modified miui rom on my sgs2 device.
As in the title, I have a problem with emergency calls. My provider's customer service number is 119,which is a default emergency number in a lot of countries. I've read somewhere around the web this list of numbers is explicitated in build.prop file. So, I unpacked the rom, found the file and the code line I was interested in and deleted the 119 entry. Repacked the file, signed and flashed it. But no changes. I'm still being redirected to the standard emergency number of my country, I suppose.
How can I fix that?

Sent from my GT-I9100 using Tapatalk

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