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Better battery life
Apple has managed to keep the 3G talk time battery life of the iPhone at 10 hours for several generations, but once you start to make heavy use of the handset, the battery life plummets to a few hours.
At a time when there are handsets offering far better battery life, Apple needs to consider whether this is enough given that handsets such as the LG G2 can beat this by a couple of hours.
I'd like to see Apple add a couple of hours to the iPhone battery life to reduce that anxiety I feel when I see the indicator fall as I'm using it. Ideally, I'd like a situation where I could use the iPhone for a full working day and only have to charge it up during the evenings.
While the iPhone's screen isn't the most fragile around – some feel like they're made of cheese – Apple needs to get beyond the need for its devices to need screen protectors to prevent scratches.
If the rumor that Apple is planning to use sapphire displays is true, then screen scratches should be a thing of the past. And if Apple is going to make the display even bigger, then a stronger, tougher screen is even more important.
About the only time I connect the cable to my iPhone is when it's charging, and given the frankly pathetic battery life, this is something I'm doing a lot.
Please Apple, add wireless charging to the iPhone. This would be so cool, and open up the way for awesome accessories such as an in-car charging cradle where I wouldn’t have to futz about plugging in the cable each time I use it.