Hi all. Moving from a 4s to a pre-used 6s. It has arrived. I wanted to check battery health but find it is running ios 11.2.5. I believe battery health check came with 11.3? I was wary about updating my 4s so kept it on 7, where it ran great. So whats the best ios for the 6s please? I am not a huge app user, but will be adding some going forward. Thanks all.
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