It's the only issue I have with the phone for the diagnostic. I'm wondering how much it'd cost now, and if I should do it rather than waste away another phone.
Your phone is probably not getting software or security updates anymore. It might cost you $80 (that is an estimate) or so. Prices have gone up, so I won't be surprised if it is more. There are good new phones that you can get another 3 or more years of use.