Pratama has managed the telco's media, brand activation and creative account for the past six years.
According to sources, Pratama's partnership with the telco brand started when Esia was still a small player in the market and has grown in importance over the years.
Esia called a pitch in July this year. Up to five agencies were believed to be in the run for its business including Mindshare and Starcom.
Recently, Esia's parent company, PT Bakrie Telecom was in talks with PT Telekomunikasi Indonesia to acquire its CDMA unit in a share deal believed to be worth up to US$1 billion.
The acquisition will be the biggest in Indonesian telecoms history since Qatar Telecom bought a stake in PT Indosat for US$1.35 billion in 2008.
The outcome would give Bakrie Telecom dominance in Indonesia's fast-growing local CDMA market.
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