iOS 4.0 was so slow on our 3G, we promptly downgraded after updating. Earlier this week, Apple announced, among other things, that iOS 4.1 fixed performance on the iPhone 3G. We put their claim to the test.

Today Apple announced iOS 4.1, addressing many bugs (like iPhone 3G performance) as well as bringing new features like HDR photography, HD video upload and TV show rentals. Additionally, Apple previewed iOS 4.2, bringing this and more to the iPad.

iOS: Google just updated their Google Mobile app to bring push notifications for Gmail and Google Calendar to the iPhone.

According to one of Apple CEO Steve Jobs' characteristically curt and cryptic email replies, a software update is "coming soon" that will fix the slow iOS 4 performance that's got iPhone 3G owners downgrading to iOS 3.1.3 in droves.

Apple's released updates for iPhones, iPod touch models and iPads that closes a nasty PDF-based exploit. That same exploit is what made one-click jailbreaking possible, of course, so upgrade if you'd like a sanctioned, secure model or hold off for future workarounds.

While website Jailbreakme.com offers a one-click jailbreak for your iOS devices via mobile Safari, it also exposes a major security vulnerability. As it turns out, jailbreaking your iDevice may provide additional security options that make jailbreaking a more secure option.

If you're an iPhone 4 owner or 3G

If you've chalked jailbreaking your iOS device up as too complicated, JailbreakMe is for you. Simply visit JailbreakMe with your iOS device's browser and enjoy hassle-free one-click jailbreaking.

Dear Lifehacker, My iPhone 3G has been intolerably slow since I upgraded to iOS 4, and while I know I can downgrade back to 3.1.3 if I really can't stand it, I was wondering if there was anything I can do to speed things up and still use iOS 4. Signed, Short on iPatience

We've already pointed to disabling Spotlight and hard resetsas ways of improving the sometimes sluggish performance of iOS4 on older iPhones. Lifehacker reader Daniel has another suggestion: get rid of excess text messages.

newVideoPlayer( {"type":"video","player":"http://www.youtube.com/v/Pdk2cJpSXLg&hl=en&fs=1&fmt=22","customParams": ,"width":570,"height":375,"ratio":0.824,"flashData":"","embedName":null,"objectId":null,"noEmbed":false,"source":"youtube","wrap":true,"agegate":false} );

If you're still a loyal iPhone 3G owner and upgraded to iOS 4, you've probably noticed one major new thing: slowness. You can downgrade to 3.1.3, but more than one Gizmodo commenter suggests a fix that's worked for them.

Apple just released iOS 4.0.1 for the iPhone 3G, 3GS and 4. The only purpose of the update, according to the release, is that it "Improves the formula to determine how many bars of signal strength to display".

iOS4 has some pretty neat features, but many existing iPhone 3G users have found performance to be pretty poor after making the switch. Before rolling back, try a couple of hard resets to see if that improves performance.

If you're upset that your iPhone 3G is missing the coolest features of iOS 4 — namely multitasking, screen orientation lock and background wallpapers — you're one quick and a simple jailbreak away from enabling them. Here's how it works.

A lot of iPhone 3G owners — myself included — have discovered that upgrading to iOS 4 has slowed their devices to a crawl. If you decide the new features and shortcuts just aren't worth the glacial performance, here's how to downgrade your iDevice.

It was previously impossible to easily synchronise your iPhone's notes between devices, but yesterday's iOS4 firmware update adds a feature capable of saving notes directly — and conveniently — to your Gmail account.

Apple just released iOS4 for the iPhone and iPod touch, and now that you've downloaded and upgraded to the much-hyped iDevice update, here's a look at the new shortcuts, settings and features you'll need to know — and want to use.