please tell me what I need to do to change my mobile service from Optus to Telstra ? my Telstra sim card is with me. How do I cancel OPTUS ?
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I am presuming you want to keep your same mobile number,
When you activate your Telstra SIM you request to port your number from Optus. This will automatically cancel your Optus account but after the SIM activation it would still be worth going to online chat with Optus to confirm your account has been closed.