MILLIONS of iPhone owners are being warned to sell up fast, with experts predicting a shock drop in mobile values of up to £300 in just days.

Apple iPhones usually hold their value, meaning you can flog your old one for a tidy sum when it’s time to upgrade.

But a top second-hand tech firm has warned prices could plunge by as much as 30% once the iPhone 17 drops .

Sam Wilson, boss at Gadget GoGo, has urged iPhone owners to flog their handsets now if they want top dollar for their next upgrade.

“You’ve got just 30 days before the value starts to tank,” he warned.

“Every year, people hang on until after Apple’s big reveal – and by then it’s too late. The market’s flooded with old models and prices nosedive.”

Why the shock fall?

Wilson said simply announcing a new iPhone is enough t

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