Black Friday is a great time to secure yourself a smartphone upgrade on the cheap, especially if you’re not fussed about having the very latest in smartphone technology.  That’s doubly true if you’re also open to refurbished smartphones, with GiffGaff offering a refurbished iPhone 13 Pro Max for as little as £399 as part of its Black Friday sale. The deal in question bags you an iPhone 13 Pro Max with 128GB of storage in either Green, Gold, Graphite,
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