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Some Samsung phones (like the Galaxy S10 Plus) have support for SD memory cards that effectively allow you to upgrade device storage capacity, but otherwise the hardware platform itself is NOT upgradable. Buying an unlocked phone gives you the freedom to purchase voice/data services from virtually any carrier (AT&T, Verizon, T-Mobile, Sprint, etc.). Just swap out the SIM card to switch. This gives you more freedom to purchase these services from whomever you please without having to switch phones.
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