What would an iPhone5 do for her that her present '4 will not?
It's like a computer upgrade, something you're familiar with. There is an incremental difference in speed and minor features. Nothing earth-shattering. I think the biggest improvements are:
- Siri was added in models 4s, 5, and later. I consider Siri to be useful in some cases, and it's a fun feature to play with.
- The camera gets slightly sharper and better with each new release (4->4s->5).
- You can unlock the lock-screen on the model 5 with your fingerprint instead of a passcode, making it easier to start using the phone when you pull it out of your pocket or purse.
- Model 5 supports faster LTE data networks if such a network is available in your area. (Note: I have a 4s and I don't miss LTE, nothing I do on the phone needs that much data.)
- Model 5 is slightly taller, with a slightly taller screen. The screen is taller but not wider. So technically the screen is bigger but its aspect ratio has changed slighly.
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IMPORTANT NOTE: Model 5 uses a completely different kind of charger/connector plug from all previous models. If she is currently making use of more than one existing charger/connector cable (for instance, one in the bedroom, one in the kitchen, one in the purse, etc), then she will need to buy extras of the new type of cord if she wants to continue having the convenience.
More details of the differences:
http://www.everymac.com/systems/apple/ip...s-iphone-4.htmlAre there different versions of Siri in the different generations of phones? Does Siri become more powerful/useful as the iPhone hardware becomes more capable?
No, as was already said earlier in the thread, Siri is pretty much the same on all phones that support it (4s and later). It is possible that Siri might respond a hair faster on the 5 than on the 4s due to the faster CPU.
For that matter, does the iPhone4 even support Siri?
Model 4 does not support Siri, only 4s and later supports Siri.
What do you think she should do?
If her current model is a 4s then I wouldn't bother, because the differences are not huge. For me, I have deliberately avoided upgrading because I worked very hard on building a custom car dock for my iPhone, and the new connector on the model 5 would mean I'd have to do that work all over again. I'm very happy with my 4s for now.
If her current model is just a 4, then yes, I'd do it. I think the 4->5 jump is worth it, but not the 4s->5 jump.
One last note: The operating system upgrades.
They keep upgrading the IOS operating system. My 4s is running IOS7 right now, and they just came out with the latest IOS8 operating system. Historically, the older phones got slower and slower with the newer operating systems. I haven't put IOS8 onto my 4s yet, because I've heard it might slow it down. At some point I will have no choice though, because there may be a feature or an app that I want that will only run on IOS8 in the near future. So I may want to upgrade to IOS8, and at that point, I may change my tune about upgrading to a model 5/6 phone if IOS8 makes my 4s slow down too much.