This is going around these forums, and others, but you can't have location-based reminders on your 3GS. Siri and the new camera and dual-core A5 are the pushes to upgrade to 4S. Siri is the withheld push that could have been implemented for older phones, yes, even just fine on the 3GS. Location-based reminders, in my opinion, are actually much cooler interface design then Siri -- I don't even like to talk on my phone, let alone WITH my phone -- reminders hardly have the sparkly retail glitter of asking your phone if you need an umbrella, or whatever. It's just a neat utility feature. It's doubtful Apple held it back to push upgrades. It obviously worked in betas, so long as you had a developer iCloud account associated with the 3GS; also doubtful they pulled it because it was broken. Yes, the GPS chipset in the 4 and 4S is more accurate and acquires faster than what's in the 3GS. No, it's not THAT much more accurate or fast. I've had a 4 and a 3GS, and they both could quickly pin me down to the freaking aisle I was standing on in a giant Walmart. That's INDOORS, people, showing of the "assisted" part of "assisted GPS". Though not everyone would have the same results, I could have set shopping reminder by STORE DEPARTMENT. I probably will be able to that when I upgrade to a 4S in a few weeks; or, I should say, order a 4S in a little over two weeks when my upgrade cycles, and receive sometime in early 2012 -- thank you AT&T for not waiving a WHOLE THREE WEEKS of contract, instead making me go the full 12 months. Anyway, back to the point, for letter-writing types, write some letters if you want location-based reminders on your 3GS. Almost surely the reason Apple is not including it for 3GS is because the model has smaller battery capacity and the GPS chipset draws more power than in the later models. For location reminders to work, the GPS has to be on all the time, which will drain the battery a lot quicker than usual, if you have location reminders on. Toddlers with iPhones would be upset. There is plenty of precedence for allowing battery-draining features and apps, so long as turning the feature on or installing the app, you're warned it will quickly drain battery. Turn-by-turn nav apps suck battery, Apple allows them. Apple turns on the LED flash for video recording on the 4 and 4S when it's needed. You think 3GS GPS will drain battery? Trying shooting 1080p video your kids' trick-or-treating marathon this Halloween with a 4 or 4S. Now THAT will drain battery, but they allow. Switching on location-based reminder should pop up this on a 3GS: "Location-based reminders on this device may rapidly drain your battery? Do you still wish to turn on location-based reminders?" Unfortunately, by the time they'd get around to doing this, the point will probably be moot for the letter-writing campaign, as they'll have cratered and upgraded from a 3GS to a 4S when they swore they weren't going to. But it'd be nice for people taking advantage of the free-with-contract deal on the 3GS. Which will be a lot of parents with school-age kids, minimizing cost for lots of family devices. If anyone should be reminded of something when he gets to or leaves a particular place, it's a 12-year-old kid. Note also, a lot of people, even with iCloud-synced reminder lists and iPhone 4s, are having problems getting the location option to show up. So either the feature is wonky and no one is really missing much, or I could be running off at the mouth and the feature actually somehow works on the 3GS if we knew how to make it work.