Well, if your wife already has the Iphone, that's what I'd go with. Since you're not looking for a ton of features, I'd go with whatever is cheapest at the phone store, or get one online. My brother buys his online.
I'm not a big fan of Iphone... I've used my brother-in-laws from time to time in Indiana, either answering or texting for him or calling for him if he's tied up in the middle of something. It's sorta like my Droid Maxx but not as "intuitive" to learn, but I think most of that comes down to 'what your used to' and not to any great difference in capability or anything... IOW they're all broadly similar now, other than memory size and screen size and stuff like that. Get one that fits your pocket and has a screen big enough for you to see.
SO, WHY do I suggest the Iphone over the Droid?? Well, because your wife already has one. You can share the same chargers and stuff and won't be constantly fumbling with each other's charger cords and stuff, since they are different between the iphone and droid and if you have one of both you have to have two of everything... make sense?? Plus, she's already familiar with it, and she can school you on how to use it. Not ashamed to admit, I had a flip phone until I got this Droid Maxx 3 years ago, maybe four... She had a smart phone before that, a Droid of some sort, I had inherited that from her when she upgraded, because my old flip phone finally died and I went through a couple of those "pocket phones" (still buttons on them but not a flip phone-- one even had a keyboard on the back of it).
It took me a week or two to get comfortable with the smart phone, but she schooled me on it and once I got used to it, it is SO much better and easier to use than the stupid flip phones or pocket phones ever dreamed of being... Plus you can do SO many things with the thing... I don't do TONS with mine, but I have a lot of apps, from FarmLogs (which shows me rainfall totals on my BIL's farm in Indiana and our two farms here separated by 100 miles, and charts the rainfall yearly in graph format and shows rainfall events and totals, against a 10 year average line... plus you can log all your stuff in field by field if you want-- planting dates, applications of fertilizer and pesticide, whatever information you want to put down (though I don't really use that feature much-- I mainly like the rainfall totals and trend lines). I use the "level" app a lot and have about 3-4 weather apps on mine-- weatherbug is good plus some other radar and local ones as well, and I keep "Weather Underground" open in my browser at all times... (I have their app too but like the browser version better-- I especially like the wind direction and speed forecast line and the precip chances and barometric pressure lines, which, when you know how to read them, let you practically predict the weather yourself.) Convertipad app is good for conversions between metric and standard and even esoteric measurement systems (foot pounds to newtons, etc). Compass is cool and handy to have, DigiHUD app is a handy speedometer in the old grain truck that the speedo didn't work anymore, DeluxeMoon app is fun, Cargo Decoder lets me have my daughter look up any hazmat placard on the road, and I have her look up the chemical on wiki and learn about what the trucks we pass are carrying and what the stuff is used for (just to give her an appreciation for how important transportation and chemistry is in the modern world, and for fun). Dry Grain Calculator app is handy to correct bushels dry to bushels wet, etc. GasBuddy is worth its weight in GOLD by helping you find cheap fuel no matter where you are... (I always use map view). Maps is also a frequently used tool that is invaluable. The calendar is enormously helpful, as is Google to look up stuff on the net, like having a computer with you all the time. You can buy a borescope camera on Ebay for anywhere from about $10 bucks on up that will plug into your phone, and using the "camera Fi" app, you can inspect the interior of pumps, engines, plumbing, etc like a $600 borescope setup would cost. Field Guide and Modes of Action apps are handy for pesticide applications, and for pest identification. I also have some apps like "Urban Biker" which will measure speeds down to a tenth of a mile per hour-- and tracks everywhere you go when you're on the tractor and how much ground you cover, which I use to make sure I operate sprayers and stuff at the same ground speed all the time, and it shows where I've applied almost like a lightbar... GeoTracker app is great for recording trips and mileage, distances, elevations, etc. "Altitude" app records changes in altitude as you move around and doubles as a speedometer as well.
To complement the "speak to text" feature of the phone (which I use with varying success), there's also an app to "read" your text messages to you as they come in, so you can keep your eyes on the road at all times... it's called "Text Message Reader". Very helpful!
I like the "Heavens Above" app for tracking satellites and watching the night sky-- projects a full sky map on your phone, you can set it to "red" for night-vision protection, and tracks satellites visible from your location and projects them on the map as they fly over, as well as other astronomical phenomena like the Moon, planets, stars, and Sun. Slide the screen sidways to see the orbit of the satellite, and slide it over once more and it'll tell you when the satellite you were looking at was launched, from where, and on what rocket, the orbital period and stuff, from what nation and launch site, all sorts of interesting information. Very cool for setting up a telescope if you're a skywatcher... Night sky tools is also neat, lots of good information about sky phenomena but not as good of a skymap. Heck I even have a visual drift estimator that will give me the distance my rocket will drift under parachute, if I type in the estimated altitude from RockSim (rocket simulator program that you can design and "test fly" rockets in the computer with various engine options) and the current wind speed and direction, so I know where to look for a rocket on the ground after its landed if I lose sight of it...
Just TONS of great stuff that you can find is immensely helpful, once you round that corner... Of course you can use as much or as little of it as you want. I was highly skeptical I'd use any of that stuff, either, when I got it, and found out how much fun and helpful it really is, now I'm really glad I got one!
Later! OL J R