Following a closed door review, M1 has retained Y&R Singapore. The agency has been with M1 for the past four years.
M1's chief marketing officer P. Subramaniam said the agency had shown a good understanding of the "extremely competitive telecommunication landscape" in Singapore.
"We are confident and assured that they will continue to be the right partner for us," he said.
The agency has seen several changes in the past year, with Melvin Kuek now the managing director of its Singapore operations, and Farrokh Madon joining as chief creative officer.