IPhone 5, iPhone 4S, or SG3?

I have AT&T. My current phone is the iPhone 4. What are some things the SG3 can do and the iPhones can't and other way around?

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The iPhone 5 is faster than the other two phones. It has the same 8MP camera as the SG3, but the iPhone 4 has a 5MP camera. The iPhone 5 iSight camera is made from sapphire, has an autofocus, geotagging and Panorama feature which allows you to take up to 28MP photos.

The iPhone 4 and 5 have the same retina display, at approximately 326 pixels per inch. However, the iPhone 5 is nearly twice as fast in download speeds as the SG3 and iPhone 4. These speeds are really not noticeable in everyday use; they're both fast anyway.

The Samsung Galaxy S3 has a 1.9MP front camera, while the iPhone 5 has 1.2MP and the iPhone 4 has VGA quality. I would recommend the S3 if you make a lot of video calls or take photos with the front camera frequently.

The Samsung Galaxy S3 runs on Android. Although the Google play store is much smaller than the iOS App Store, a lot of things work slightly more seamlessly than on an iPhone. You login with your Google account, then you've got your email, YouTube, google chrome, blogger and media stores covered. With iCloud, your email is separate from everything else.

Hope I helped!

IPhone 5 is good one to buy in comparison of others.