If you opt out of it your phone will suddenly turn off, which is definitely not an improvement over being slow. Having the opt-out is nonsense and an example of

If you opt out of it your phone will suddenly turn off, which is definitely not an improvement over being slow. Having the opt-out is nonsense and an example of bad regulation. This isn't the only reason an old phone would be slow though, batteries are not the only consumable component in a phone.