Will getting my iPhone 4S unlocked by my carrier void my warranty?

I'm currently on T-Mobile, but wish to switch to GiffGaff. If I ring up T-Mobile and pay the required cost to get it unlocked, will it void my warranty?

No, not if you're ringing up T-Mobile to do it officially.

No. Why would that be the case?

I'm doing technical support for mobiles phones and i can assure you that if you are calling your network provider to ask them the subsidy password, given after 6 months for free, you will not void your warranty.

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