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TravelSim is a brand-name of Top Connect OÜ, Estonia based telecommunications company headquartered in Tallinn. TravelSim is a Prepaid GSM SIM card that provides telecommunications to clients in 190 countries. TravelSim has 3.5 million subscribers all over the world as of August 2013.[1] TravelSim is a Callback service for voice communications, it has SMS, MMS, GPRS and Voicemail functionality.