What does Briefkasten look like on SoftBank?

On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.

When did SoftBank add Briefkasten?

SoftBank first drew Briefkasten in 1999, released 1. Januar 1999.

SoftBank Corp. has shipped 8 versions of Briefkasten. Each is dated, so you can see when the design changed.

SoftBank

SoftBank Corp. has drawn Briefkasten 8 times. Every revision SoftBank has shipped is below, newest first.

What does Briefkasten look like on SoftBank?: On SoftBank it is the design shipped in 2014, shown above at full size. Older revisions are listed beneath it.
When did SoftBank add Briefkasten?: SoftBank first drew Briefkasten in 1999, released 1. Januar 1999.
How many times has SoftBank redrawn Briefkasten?: SoftBank Corp. has shipped 8 versions of Briefkasten. Each is dated, so you can see when the design changed.

SoftBank artwork for this emoji spans 1999 to 2014.