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1. I recently turned off WiFi. And now getting an extra day out of my Ultra
5. I personally do not want to pay ATT $10 a month for the privilege. I do not use that much and always have my phone with me.
 
Pretty sure you could get this today if you were to turn on power save mode.

I can get 2-3 days without it on an ultra 2. YMMV of course depending on usage and how much you use cellular away from the iPhone.

Personally - camera? Don't want. Its space that could be more battery or screen...
I get 2-3 days without power save mode. I charge while getting ready in the morning, about 25 minutes. By the evening of the third day, I'm around 25% and I'll charge while watching TV.
 
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I get 2-3 days without power save mode. I charge while getting ready in the morning, about 25 minutes. By the evening of the third day, I'm around 25% and I'll charge while watching TV.

Same. Reliably 2 days... 3 as you describe above.

But would be nice to have 3+ days with zero charging - without an iPhone nearby to connect to the internet - as that would cover a camping long weekend without power.
 
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