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Carrier vs unlocked Galaxy firmware: what changes when you flash between them

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Two Galaxy phones with the same model name can run different firmware, with one showing a carrier logo, preinstalled carrier apps, and slower updates, while the other boots cleanly and typically updates sooner. Carrier firmware is Samsung software that a mobile operator has adapted and approved for its own network, including its logo, apps, network settings, and a region code that controls carrier features. Updates for carrier phones are first tested by the carrier, which explains the delays compared with unlocked devices that receive patches directly from Samsung. Switching to unlocked firmware removes carrier branding and apps and speeds up updates, but it can disable features such as Wi-Fi calling, video calling, and visual voicemail. The firmware change also does not remove a SIM lock, so the phone still needs the carrier's unlock approval to accept another carrier's SIM.

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