We’re all going to be diving into the deep end with iOS 9. While many of the changes are subtle, there are a fair number of differences in both the visual style and the under-the-hood workings of Apple’s new mobile OS.

That means this a perfect time to take a deeper look at all the killer stuff you don’t want to miss. These iOS 9 tips will help you make the most of all the great new features.

Hackers have just given iPhone and iPad users a big reason to upgrade to iOS 9 due out later today: it fixes a serious AirDrop security vulnerability.

Mark Dowd, an Australian security researcher with Azimuth Security, revealed this morning that iOS 8.4.1 contains a critic security flaw in AirDrop that could allow an attacker to install malware on any device within range. Worst of all, even if a victim tried to reject the incoming AirDrop file, the bug lets attackers tweak the iOS settings so the exploit will still work.

Check out the lethal bug in action:

If you’ve been anxiously waiting to upgrade your Apple Watch to watchOS 2 today — well, sadly, you’re out of luck.

Despite announcing last week that watchOS 2 and iOS 9 would be released today, Apple has just dropped the bombshell that Apple Watch users won’t be upgrading their operating systems quite yet, thanks to the discovery of a critical bug.

When you back up your iPhone before upgrading to iOS 9, you have a couple of choices. You can use iCloud or iTunes.

For your best, most comprehensive backup, connect your iPhone (or iPad) to iTunes. Seriously, iTunes backs up almost everything — and it’s your best bet for downloading iOS 9 when the upgrade becomes available today.

Here’s how to do it.

iOS 9 won’t shock you with a bunch of whiz-bang new features or a drastic new look, but in many ways, Apple’s latest mobile operating system is more important than its two immediate predecessors. While iOS 7 and iOS 8 laid a foundation that embraced the future of mobile design, iOS 9 is making all those changes worth a damn.

Apple drops iOS 9 today, bringing a more intelligent UI, better built-in apps, a smarter Siri and much more. Our iOS 9 review shows how the new software makes everything you do on your iPhone or iPad easier — and far faster — than ever before.

Time’s a crazy thing: it’s different everywhere! So if you’re wondering when iOS 9 will drop tomorrow, well, it’ll probably be different from us depending on where you are.

Thankfully, just by consulting this chart, you can know exactly when you should start tapping the update button according to where you are in the world.

Behold! The iOS 9 Worldwide Release Time Chart!

Indian Prime Minister and noted iPhone user Narendra Modi has requested to meet Tim Cook during his upcoming visit to the U.S. — reportedly to discuss the possibility of Apple investing in R&D and manufacturing in his country.

Modi arrives in New York on September 24 and 25, before heading to the West Coast on September 26 and 27.

iOS 8 is about to join the big tech scrapyard in the sky, but before it’s replaced by iOS 9, Apple has posted one last set of adoption figure — showing that a whopping 87 percent of eligible users upgraded to Apple’s last-generation mobile OS.

The last universal remote we bought cost $20 from Walgreens. It was a big, ugly hunk of plastic, but it controlled the TV and VCR just fine.

These days, things have gotten a little more complicated. Now we have an HDTV, three set-top boxes, two game consoles and Sonos, as well a Nest thermostat and a bunch of Bluetooth-connected lightbulbs.

Logitech’s new Harmony Elite is a universal remote that controls all these devices and more. It’s price is listed at an eye-popping $350, but this is much more than a TV remote. It’s a smarthome hub for just about every connected device in your house, designed to give HomeKit and Siri a run for their money.

Stephen Colbert’s Late Show is hosting Apple head Tim Cook in tonight’s episode, and it’s a pretty big opportunity to have the ear of one of the most powerful business leaders in the country. We’re sure that Colbert already has a list of questions he and his staff have prepared for Cook, but here are some we hope to see when the show airs later.

They’re not all good questions, mind you, but we’d still love to see them.