Wanna update my phone storage
How can I upgrade my iPhone 6
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Hello ~ Your iPhone 6 cannot be updated past iOS 12.5.6. If you want to run the current iOS you will need a newer iPhone. If you choose a second hand device please take a moment to read these…
Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Also:
The All Too Common SAD Reality of Buying a Used iPad/iPhone
~Katana-San~