What does NGマーク look like on DoCoMo?

On DoCoMo it is the design shipped in 2013, shown above at full size. Older revisions are listed beneath it.

When did DoCoMo add NGマーク?

DoCoMo first drew NGマーク in 2001, released 2001年1月1日.

NTT DoCoMo has shipped 4 versions of NGマーク. Each is dated, so you can see when the design changed.

DoCoMo

NTT DoCoMo has drawn NGマーク 4 times. Every revision DoCoMo has shipped is below, newest first.

What does NGマーク look like on DoCoMo?: On DoCoMo it is the design shipped in 2013, shown above at full size. Older revisions are listed beneath it.
When did DoCoMo add NGマーク?: DoCoMo first drew NGマーク in 2001, released 2001年1月1日.
How many times has DoCoMo redrawn NGマーク?: NTT DoCoMo has shipped 4 versions of NGマーク. Each is dated, so you can see when the design changed.

DoCoMo artwork for this emoji spans 2001 to 2013.