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**Chris** · 17-01-2017, 15:46

Yes. We have a 5s that had 9 on it when we first got it, used 4g no problem.

You can reduce battery drain by checking what runs in the background and switching off whatever you don't need. Most apps don't need background refresh for starters.

17-01-2017, 15:46	#2
Chris Trollsplatter Cable Forum Team Join Date: Jun 2003 Location: North of Watford Services: Humane elimination of all common Internet pests Posts: 36,906	Re: 4G running iOS 9 Yes. We have a 5s that had 9 on it when we first got it, used 4g no problem. You can reduce battery drain by checking what runs in the background and switching off whatever you don't need. Most apps don't need background refresh for starters.