That's interesting and helpful, to say the least. It wasn't a concern that you might perhaps be courting a controversy by posting - aside from the fact it's apparent you, like many of us, had your fill of those already, the very nature of the thread would get it yanked quickly if it were not constructive in nature as it developed. But it did seem peculiar that from your angle of approach you'd even be considering an iPhone since you describe a set of conditions which clearly do show it to be deficient.
In the end, the funny thing is that the iPhone attracts potential buyers who are clearly not at all happy with it from the outset due to a range of issues (as we've regularly seen repeated here). Yet there seems something about it that defies common sense. People dislike the features, lack of functionality, absence of resources that 'even basic cellphones have', but they still want one or use one. You and I both really know why. That despite it's shortcomings, it
is something quite special. It breaks what have become the traditional approaches to mobile telephony. It isn't a flip, doesn't have a slide, doesn't have tiny buttons that make fumble-fingers out of everyone but the most expert texters. It doesn't use a tiny screen that once you've applied anything but the basic wallpaper makes everything else indistinct. I doesn't have multi-function buttons that change purpose so often that before you can select anything you have to check to make sure the button does in this mode what it was labeled for in the last. It doesn't have a menu structure that makes finding the most basic setting a chore of polar-expedition proportions. It doesn't have idiotic features included like they were afterthoughts grafted on by manufacturers intent or treating us like children, appealing to our instinct for anything that looks cool.
Instead, it's a distinct, complete, seamlessly unified product, which works like a charm out of the box, and where the only time you'll ever really need the manual is to download a copy of it just incase. It is simplicity and a real joy to use it, and it makes what tools it has so accessible that every other cellphone manufacturer should be kicking themselves all the way to Taiwan and back for not thinking of doing it this way 5 years ago if not 10. And what's more, the very fact is
doesn't have the old, tired, feature set of toy functions thrown in because they were an easy sell is another reason it seems so incredibly popular.
So, I certainly understand the interest. There are other devices - less seamless, less intuitive, less accessible, less.... well, less functional in the user sense - which are probably also worth consideration as you replace the old cellphone. First on my list would be a Blackberry. I have one, and it's a work of genius considering when the design originated. They are tough, have removable batteries, flexible tools, lots of functionality. They are a bit awkward to use, rather dated in UI and more expensive on data plans than the iPhone, but for serious -must work- users, there's little to touch them for viability and use.
That said, as someone who is dependent for much of each day on cellphone connectivity, on being able to deal with email and messaging, distribution of such things as photos and documentation, I've found the iPhone invaluable and completely reliable. I have not lost any call or had no service available, nor has the device misbehaved in any real way. I use it, and part of why I like it is that I never have to give it the slightest thought.
There is a legitimate concern over how robust it really is. The glass screen is tough, but not indestructible, and the casing can be damaged by dropping or otherwise abusing it. This is not a device you can buy and thoughtlessly chuck around like a pack of ham sandwiches. That said, it's sturdy and while modern flip phones are smaller, they are also more flimsy, more likely to burst at the edges if flexed or more likely to crush if sat on.
If you actually have AT&T service in your area, then the only real drawback in the iPhone in your situation as you describe it now is the lack of ability to swap out batteries. Battery power is not something you can be flexible about if you are not in reliable reach of power. The iPhone is by no means bad - I charge mine every day, but after 24 hours it's only down about 1/3 of a charge, so with a number of short calls each day, a fair amount of email work, use of the camera and some web browsing, not to mention the occasional audiobook playback or access to YouTube or the iTunes store if I have little to do (and no iPhone thread to reply to!) it would last a couple of days without charge. But no more than that, and by the end of the second day when the charge level was getting low, I'd be getting nervous about calls and usage.
If there were a portable add-on battery for charging as there has been for iPods (there may be but I haven't seen one that is assured for iPhone use) then that would be far less of an issue, but in your situation I'd be far less concerned about reliability and far more about that aspect of it.
I have to say that I like mine a lot. As you'll have gathered, I have little good to say regarding the state of cellular services these days, and the iPhone is a breath of fresh air. In 2 years time this is going to be an awesome, matured, product. At the moment it's like a bit of a wayward child with a mind of it's own. I like that though and I can live with that.
My advice would be to look around for an add-on charger/battery to see if there is one and it would help assuage your concerns over battery life, but not give too much thought to reliability, because I don't think that's been much of an issue for the majority. For posters here, certainly, and I don't mean to belittle their problems with it in any way, but this is an awfully quiet forum for their being well over 1 million of these things in use.
Ultimately though, if you can't be sure, check out the Blackberry models instead. They're not so cute, and far less seamless and transparent, but awfully competent devices.