05 · Indonesia Mobile Operators and Number Prefixes¶
Target readers: Deputy team lead, operations, SMS campaign owners, risk control Core question: Which mobile operators exist in Indonesia? Who is "TK"? How to identify the carrier from a phone number prefix? Related sections: - 11 Platform Handbook / Feifan / 16 Marketing Tools / 09 SMS Follow-up Copy Library - 02 Tech Stack / 17 IP Investigation and Indonesia Network Reality - 07 Finance & Payments / 03 Indonesia E-Payment Ecosystem Last updated: 2026-04-19
1. Major Mobile Operators (Post-merger landscape, January 2025)¶
After XL Axiata and Smartfren merged into XLSmart in January 2025, the Indonesian mobile market consolidated into a three-player landscape.
1.1 Telkomsel (TK / TSEL)¶
| Field | Content |
|---|---|
| Ownership | Controlled by state-owned Telkom |
| Market share | ~45% |
| Position | Largest operator, widest network coverage |
| Brands | Kartu Halo, Simpati, Kartu AS, Loop, By.U |
1.2 Indosat Ooredoo Hutchison (IOH)¶
| Field | Content |
|---|---|
| Market share | ~28% |
| Formation | Merger of Indosat and Tri (3) |
| Brands | IM3, Tri |
1.3 XL Smart (XLSmart)¶
| Field | Content |
|---|---|
| Formation | Merger of XL Axiata and Smartfren in January 2025 (~USD 6.5 billion) |
| User base | 94.5 million users |
| Brands | XL, Axis, Smartfren |
2. "TK" Stands for Telkomsel¶
Industry abbreviation TK / TSEL = Telkomsel.
The SMS delivery industry focuses most on TK prefixes, because Telkomsel holds the largest market share and widest network coverage, making it the critical operator for SMS reach.
3. Prefix Identification¶
Indonesian mobile numbers start with 08. The international format is +62 or 62 (replacing the leading 0).
Prefix lookup table¶
| Operator | 0-prefix |
International (62) |
|---|---|---|
| Telkomsel (TK) | 0811, 0812, 0813, 0821, 0822, 0823, 0851, 0852, 0853 | 62811–62813, 62821–62823, 62851–62853 |
| Indosat (IM3) | 0814, 0815, 0816, 0855, 0856, 0857, 0858 | 62814–62816, 62855–62858 |
| Tri (3) — now under IOH | 0895, 0896, 0897, 0898, 0899 | 62895–62899 |
| XL | 0817, 0818, 0819, 0859, 0877, 0878, 0879 | 62817–62819, 62859, 62877–62879 |
| Axis (under XL) | 0831, 0832, 0833, 0838 | 62831–62833, 62838 |
| Smartfren | 0881, 0882, 0883, 0884, 0885, 0886, 0887, 0888, 0889 | 62881–62889 |
To identify TK, just match the prefix¶
International format: 62811 / 62812 / 62813 / 62821 / 62822 / 62823 / 62851 / 62852 / 62853
0-prefix equivalent: 0811 / 0812 / 0813 / 0821 / 0822 / 0823 / 0851 / 0852 / 0853
Source Note¶
Operator market shares, brand ownership, merger timing, and prefix assignments above were compiled from team learning discussions, for daily use in SMS campaigns and prefix-based user operations.