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I live in Australia and I know there's carrier firmware for Samsung phones Optus, Telstra, Vodaphone, and just XSA for Australia I would like to know if Optus, Telstra, Vodaphone specifically tune there modem files they provide in there firmware, so using Optus firmware with Optus sim card provides a better reception, battery life network speeds, then say using XSA with a modem that's for all Australia and no specific network intended.

Thanks.

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