How much could I sell this iPhone 4 for?

IPhone 4, Black, 16GB, Locked to Vodafone UK (I can easily unlock it), 3 years old, perfect condition physically (always had a case and screen protectors), half-broken home and power buttons, iOS 7.

I think around £25? Considering both the buttons need a grudge for them to work… How much is the estimtate?

I'll buy it for 10 euro

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