I was using the format-phone to format a phone number, but it also includes the international code at the beginning. I tweaked the format-phone helper to make it work for me, but it would be cool if this supported US and International phone numbers (10 or 11 digits).

If you want, I wouldn't mind forking it and adding that in myself. Thanks!

Is ember-string-helpers compatible with Ember 1.13?

Are you interested in transferring ownership of this addon? It hasn't been updated in awhile. Or are you more interested in PR's?

This addon probably shouldn't import moment with bower, as it creates problems (multiple versions of moment are imported, moment-timezone doesn't work) for people that use npm's ember-cli-moment-shim, which is probably how most people include moment these days.
Maybe just add "ember-cli-moment-shim": "^1.3.0", to package.json instead.