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.
Still left this logic with ```hasUniqueCarriers || hasUniqueTypes```, but can confirm with Vicky if you have doubts.