Telefonica, Telefonica
France: Orange, SFR, Bouygues Telecom
Germany: T-Mobile,
British Vodafone, O2,
Indian mobile operators Bharti and Bharti Airtel
Vietnam Mobile Operators Viettel, VinaPhone and MobiFone
Russian mobile operators Vimpelcom and Megafon, Mobile TeleSystems (MTS) and Megafon.
Belgium's mobile operators Proximus, BASE and Mobistar (one feature of Belgium is that they don't need to pre-store phone bills and sign network access agreements. In the European mobile communication market, it's almost produced, and making phone calls is super cheap. O2 and Vodafone, Orange and T-Mobile can't be listed in Belgium for a long time, so if you hear about O2 and Vodafone, Orange and T-Mobile in Belgium,
Brazilian mobile operators Telemar/O and Unicel
Mexican mobile operator Telcel
Canadian mobile operators Rogers Wireless, Bell Mobile, Microcellular and TELUS Mobile.
Korean mobile operators SKT, KTF, LGT
Japanese mobile operators NTT DoCoMo, KDDI and Softbank (Japan's former Vodafone, but he went bankrupt)
Australian mobile operators M2, Agile, Telstra and Optus.