Apple News: Older iPhone slow?
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Apple admits to strategy to deal with iPhones with older, deteriorating batteries. The new iOS slows down some processes, so that your iPhone won't turn off unexpectedly.
If you're unhappy with the slowdown, you have two options:
1. Buy new phone - if that was already in your plan, go ahead and make the big purchase!
2. Repair - if your iPhone 6, 6 Plus, 6s, 6s Plus, 7 or 7 Plus is still working for you otherwise, simply replace the battery. It's a simple and inexpensive repair. I can do it in under an hour at the location of your choice, while you wait.