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If I recall "Magnuson-Moss Warranty Act" says that your warranty cannot be voided simply from rooting. The carriers have to prove that rooting the phone is the cause of the problem before your warranty service can be denied.
2 years ago on Editorial: Why Locked Bootloaders Hurt Everyone (And Are A Big Deal)
@JosephMarquis Yea that's what I did. What has the boot loader done? Nothing except annoy the customers. It's always boggled the mind, because for the people who want to root/jailbreak/hack their phones they will always find a way to do so. The people who do not want to root their phones won't, simple as that.
2 years ago on Verizon Confirms Galaxy S III Locked Bootloader, After Blaming Samsung
You don't have to boycott the device, just have to boycott the company. Plenty of other carriers that offer this great phone.