Removed sms code

[grzesiek2010]

Closes #2934

What has been done to verify that this works as intended?

I ran all tests we have and everything seems fine.

Why is this the best possible solution? Were any other approaches considered?

We can't use sms in automated way due to Google policy so we decided to get rid of the unused code.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

It doesn't require testing.

Do we need any specific form for testing your changes? If so, please attach one.

No.

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No.

Before submitting this PR, please make sure you have:

• run ./gradlew checkAll and confirmed all checks still pass OR confirm CircleCI build passes and run ./gradlew connectedDebugAndroidTest locally.
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines

[grzesiek2010]

I had been waiting long and I think now it's a good time, we don't have big pull requests which we would need to update, so it would be good to merge this pr as soon as possible.

[seadowg]

Looks great! I'm going to hold off on merging this to let #3772 get through without any potential conflicts

[lognaturel]

So sad we have to do this but so it goes. Thanks for doing the dirty work, @grzesiek2010.

@seadowg, no major conflicts with #3772 so let's get it in.