BackMarket has unlocked i6 variants for $69, so I am sure that you could jailbreak one and do something with it, but I don't know how many apps run on a 7-year-old iPhone.
Mom had a 6 and then a 7, but was having problems with that before I bought her i10 a while ago.
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"Oh if you use math, reason, and logic you will be hated."--OilPan4
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