The iPhone 4S, launched in October and has been a success for Apple. It completely shattered opening weekend sales records and continues to experience high demand as it is launched in more and more locations.

And the sales of the iPhone 4S have been good for all carriers that offer the device – AT&T, Verizon, and Sprint, who made the iPhone 4S their first ever Apple product. But the iPhone 4S performs differently on each network. And according to a study by Metrico Wireless, there are advantages to owning the iPhone 4S on both Verizon and AT&T.

First up, in terms of data speed for the iPhone 4S, AT&T dominates. They maxed out at 6047 Kbps and had a mean rate of 3210 Kbps. Second place went to Verizon, but they weren’t really even close. They maxed out at 2371 Kbps and had a mean rate of 1071 Kbps. Sprint finished in last place:

So, after scoring one for AT&T in terms of data speed, let’s score one for Verizon when it comes to reliability. Metrico tested call failure rates and found that Verizon was the best, with only a 2.1% failure rate. AT&T placed second with 2.8% and Sprint brought up the rear again with 3.7%.

Metrico downloaded 21,000 pages, made over 6,000 calls and performed 8,000 speed tests to come up with this data.

Do you have an iPhone 4S? If so, what network do you use? Do these findings hold true to your personal experience? Let us know in the comments.