Bug 925404 - [B2G] [SMS] Always include the phone number in the SMS Thread UI, even if the carrier is known. r=schung

* Using new phone format everywhere;
* Using different color for carrier name in the thread view header;
* Removed a bunch of unsed code.
How about we add comment about why we need to localize the space/separator (https://bugzilla.mozilla.org/show_bug.cgi?id=925404#c46)