I wish for a magically enhanced iPhone that's always the latest model.
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Modern civilization collapses and your model is last ever made.
But is still magically enhanced. Siri is super smart now and also your only semblance of human contact. You spend the rest of your life feeling inferior to your phone.
At least until the battery dies. Since civilization has collapsed, it can't be recharged.
Definitely longer than I'd need to get tired of an insufferable super intelligent Ai ;-)