It is absolutely free this time for all users. Click here to upgrade your iPhone, and here for your iPod Touch. ZDNet has published a helpful tutorial to help you with the upgrade. We highly recommend that you upgrade immediately since it includes several improvements that make these devices a pleasure to use. Learn more about the iOS4 upgrade and the features it includes in this review by Macworld.
Some early adopters of iOS4 identified a problem with Mobicip's Safe Browser, and it has since been resolved. We have posted an update for Mobicip's Safe Browser to take advantage of iOS4 features like multi-tasking and state restoration. What it means to you is zippy and instant-on performance. We will post a note here as soon as the update is available on the App Store.
UPDATE: As promised, Mobicip Safe Browser's update for iOS4 is now available on the App Store. The update is a free download for existing users. Simply launch the App Store on the device to download the update.
Please upgrade to the new OS and enjoy the new features!