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The Optus Cel-fi GO 4 repeater is a mobile phone booster and wireless broadband signal booster that increases the internal mobile signal for Telstra (switchable to Telstra or Vodafone). The Cel-Fi handles multiple devices and improves voice quality and data speeds. 3G / 4G / 5G* Repeaters for various applications are available. Our Cel-Fi Repeaters are 100% legal approved by the carrier and ACMA. * 5G is not enabled, pending carrier approval.