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PT XL Axiata Tbk. ('XL'), Indonesia GSM operator. Service in voice, text messaging, Internet Mobile Broadband.

Website: www.xl.co.id
Customer Service: If you have questions regarding  XL's products and services, and also service complaining, please contact the following numbers:
- From PSTN: +62-21-579 59 818 (charges may vary, based on operator tariff) 818
- For services through IVR (Interactive Voice Response). Free of charge. 817
- To talk to XL Contact Center Representatives. Rp 350,-/call.
Fax: +62-21-579 59808
e-mail: customerservice[at]xl.co.id

PT. Indosat, Indonesia GSM operator. Service: voice, text messaging (SMS), Internet Mobile Broadband

Jl Medan Merdeka Barat No. 21 Jakarta 10110
E-mail : publicrelations[at]indosat.com
Website: www.indosat.com
Telp : (+62-21) 3000 3001 ext. 614
Fax : (+62-21) 3000 3754

PT. TELEKOMUNIKASI SELULER (TELKOMSEL)

Official Website: www.telkomsel.com

Head Office based in Jakarta
Wisma Mulia, Lt. Mezzanine
Jl. Jend Gatot Subroto N o 42. Jakarta 12710, DKI Jakarta
Telp. (021) 5240811  Fax. (021) 52906121

Northern Sumatera Region domiciled in Medan
Gedung Selecta, Lt.1
Jl. Listrik  No.2 Medan 20112, Sumatera Utara.
Telp. (061) 4550811  Fax. (061) 4149811

Northern Sumatera Region domiciled in Batam
Graha Telkomsel
Jl. Engku Putri, Batam Center, Batam 29432.
Telp . (0778) 467811  Fax.(0778) 467911

Southern Sumatera Region domiciled in Palembang
Jl. Veteran No.89A, Palembang 30114 Sumatera Selatan.
Telp. (0711) 374811  Fax. (0711) 373811

Regional Greater Jakarta and Cilegon located in Jakarta
Atrium Mulia, Lt.7
Jl. HR. Rasuna Said, Kav.B10-11, Jakarta 12910.
Telp. (021) 52909811Fax.(021) 522278
  West Java Region domiciled in Bandung
Gedung Wahana Bhakti POS Lantai 2, Jl. Banda no. 30, Bandung 40115 

Central Java Region domiciled in Semarang
Gedung Bank Panin, Lt.2
Jl. Pandanaran No.6-8, Semarang 50135, Jawa Tengah
Telp. (024) 8419123  Fax. (024) 8419120 / 26

East Java Region domiciled in Surabaya
Gedung Plaza BRI, Lt.16
Jl. Basuki Rahmat No.122, Surabaya 60271, Jawa Timur
Telp. (031) 5353811  Fax (031) 5311132

Bali Nusa Tenggara Region located in Denpasar
Jl. Diponegoro No.134, Denpasar 80113, Bali
Telp. (0361) 228811  Fax. (0361) 261211

Kalimantan Region domiciled in Balikpapan
Panin Tower, Grand Sudirman Lt. 6
Jl. Jend. Sudirman No. 7, Balikpapan 76113, Kalimantan Timur
Telp. (0542) 419811  Fax.(0542) 441036

Sulawesi, Maluku and Papua located in Makassar
Gedung Sucofindo, Lt.2
Jl. Urip Sumoharjo N o.90A Makassar, Makassar, Sulawesi Selatan
Telp. (0411) 420811  Fax. (0411) 420656

Source: http://www.telkomsel.com/about/corporate/368-Profile.html