List of excluded operators/carriers
around the world that does not support call back services.

Country Carrier
Afghanistan Estisalat 
Argentina Claro 
Telefonica
Armenia Karabakh Tel 
Aruba Digicel 
Australia Optus
Vodafone
Azerbaijan Bakcell
Bahamas BTC
Benin Etisalat
Bhutan B-Mobile
Bolivia NuevaTel
Bosnia Herzegovina HT Eronet
British Virgin Islands CCT
Cameroon Orange
Canada Rogers 
Telus
Videotron
China China Mobile
Congo  Airtel
Costa Rica Telefonica
Czech Republic O2
Vodafone
Denmark H3G
El-Salvador Claro 
Ethiopia ETC
Faroe Islands Faroese Tel
Fiji Digicel
Vodafone
France Transatel 
Gabon Airtel 
Libertis
Gambia Qcell
Germany Emnify
O2
Ghana AirtelTigo
Guam IT&E
Guatemala Claro
Guyana Digicel
Honduras Claro
Hungary Vodafone
Iceland Siminn
India BSNL
MTNL
Iran MCI 
Kenya SafariCom
Kuwait Ooredoo
Lesotho Vodacom
Macau CTM
Madagascar Airtel
TELMA
Mali Orange
Malta Vodafone
Mauritania Mauritel
Moldova Moldcell
Monaco Monaco Tel
Morocco Medi Telecom
Myanmar MPT
Nauru Digicel 
New Caledonia OPT
New Zealand Vodafone
Nigeria Airtel 
Etisalat
MTN
Pakistan Jazz
Palestine Jawwal
Papua New Guinea Bmobile
Paraguay Claro
Peru Telefonica
Philippines Digitel
Globe
Puerto Rico Claro
Reunion Orange
Romania T-Mobile
Rwanda Airtel
Samoa BlueSky  
Digicel  
Saudi Arabia Mobily 
Senegal Sentel
Sri Lanka Hutch
Suriname Digicel
Sweden H3G
Syria Syriatel
Taiwan VIBO Telecom
Tanzania Airtel
MIC
Trinidad & Tobago Digicel
Tunisia Orange
Turkey AVEA 
Turkmenistan TMCell
MTS 
UAE Etisalat
Ukraine MTS 
United Kingdom EE
Venezuela Digitel 
Telefonica
Vietnam Vinaphone
Zambia Airtel
Zimbabwe Econet
Telecel
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