Smith, along with former vice captain David Warner and Cameron Bancroft, remains banned from international and state-level cricket in Australia as he serves out a 12-month suspension for his part in the Cape Town scandal.
Vodafone Australia's "Gutsy is calling" commercial starts with a voice overlay of Smith's tearful apology when he fronted the media upon his return home from South Africa before cutting to scenes of him playing for local club Sutherland and conducting a coaching clinic.
"Everything I dreamed of, everything I was a part of was just falling to pieces," Smith says in the commercial.
"I was in a pretty dark space. It was just about being upfront and honest and taking responsibility.
"I've certainly had some difficult days. But it's OK to be vulnerable. Everyone makes mistakes. It's about the way you respond to it that's really important."
It concludes with Smith saying: "I want to come back better than I was."
Smith has shunned interviews since returning home from South Africa in disgrace but is set to front the media on Friday before training with Sydney Sixers, a local team in Australia's 'Big Bash' Twenty20 tournament.
Smith is also banned from playing in the Big Bash, which is sponsored by Vodafone Australia.
Local media reported Smith was donating his fee for the advertisement to a local charity for men's mental health.
The advertisement -- and Smith's participation in it -- was quick to draw criticism from local media pundits and drew mixed responses on social media.
"Don't use mental illness to try and flog off some phones," 3AW radio host Justin Smith said on the Melbourne station.
"Looking at this tacky rubbish, I wonder if he's learnt anything at all."
Vodafone Australia responded to criticism from one Twitter user, saying the company was supporting Smith "in his mission to spread awareness about mental health for young Australians."
Australia, now led by Smith's replacement Tim Paine, is tied 1-1 in the current four-match test series against India ahead of the third contest in Melbourne starting next week.
Smith and Warner are suspended until the end of March, 2019.
Bancroft's ban expires on Dec. 29.
First Published: December 20, 2018, 1:45 PM IST