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You need to have the Xposed Framework installed in order to make this app/module work!!!
It is not necessary to install this app on a device already having the SMS and tetheing functionality. This mod might also work on non-Nexus or Moto devices though, with a proper radio (2G, 3G, 4G) but with disabled SMS or with disabled tethering options (by the vendor/provider).
I would appreciate it if you could rate the module after trying it out and maybe leave a comment to explain what you think of it. Maybe you also have a feature request.
The tethering function for example was such a feature request.
Link to Xposed-Repo: http://repo.xposed.info/module/de.makuser.nexussms
Official XDA-Thread: http://forum.xda-developers.com/showthread.php?t=2562026
Link to BETA Community: https://plus.google.com/communities/108661154979401531573
Link to join BETA: https://play.google.com/apps/testing/de.makuser.nexussms