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Verizon iPhone versus AT&T iPhone: CNET's data winner is... (video)

Is the Verizon iPhone as fast and powerful as devotees had hoped? CNET breaks down timed speed tests against the AT&T iPhone on four counts.

AT&T iPhone versus Verizon iPhone

Faster, sexier, more reliable signal. That's the hype propping up the Apple iPhone 4 for Verizon at the expense of rival carrier AT&T. But is the iPhone really that much better on Verizon than on AT&T? The answer so far: absolutely.

To test the phones, CNET Senior Editor Kent German and I traipsed all over San Francisco to conduct our field testing showdown between the AT&T and Verizon iPhones. We compared signal strength, upload and download speeds, and load times between the iPhones on the two networks.

In addition to the results below, you can also check out more connectivity tests, and this roundup of all things Verizon iPhone.

Now playing: Watch this: Battle of the networks: The iPhone on AT&T and Verizon

The tests

We ran four tests each in four locations that have given us trouble in the past on multiple networks.

First, we checked the number of bars that appeared in the signal meter. We know that bars are an arbitrary measurement because they fluctuate so often and don't always translate into real-world connectivity. Still, for many people they are a key indicator of service.

Next, we used the Root Metrics iPhone App to measure signal strength and upload and download speeds. Third, we uploaded a photo to Facebook--the same picture for each round for both phones. Lastly, we loaded the Web site.

The locations

CNET's garage served as the first location, a natural fit since the above-ground parking lot is constructed from thick, signal-blocking concrete. Next we drove over to Treasure Island, a slug of man-shaped landfill mounds in the middle of the San Francisco Bay that's removed from clusters of cell towers. Next we stopped on a busy downtown street in the Financial District, where tall buildings and throngs of smartphone users add up to often iffy service. Finally, we climbed into the Twin Peaks neighborhood, a high roost that's home to a dead zone for multiple carriers that's confounded Kent time and again.

How they fared

And the winner is...




Photo uploading
Load a Web site
*We omitted the "bars" test because that indicator doesn't reflect performance testing.

Verizon devotees scored big points as the iPhone on its network consistently outperformed the AT&T iPhone in all but two tests.

However, before you fly Big Red's banner, keep in mind that these results are indicative of our particular experience. Results in your area may differ, and they may also change over time. Although AT&T's HSPA 3G network is technically faster than Verizon's EV-DO, the results don't always align. Coverage depends heavily on your exact location and even the time of day.

Additionally, Verizon was supporting very few iPhones at the time we tested the phone--performance factors could very well change in San Francisco as well once the number of iPhone users grows on Verizon's network. Yes, there are other smartphones on both networks that impact data load, but Verizon could be gaining a much hiegher percentage of high-data users in the near future if new customers flock to the iPhone--either because they're switching from another network or because they're switching from a feature phone. Either way, we plan to revisit testing in several months when there are more Verizon iPhones on the market.

The detailed results

iPhone versus iPhone





Test 1: Number of bars
AT&T 4-5
Verizon 5
Test 2: Download/upload speeds*
Download: 40Kbps
Upload: 28 Kbps
Download: 189Kbps
Upload: 24 Kbps
Download: 116Kbps
Upload: 173 Kbps
Download: 120Kbps
Upload: 130 Kbps
Download: 518Kbps
Upload: 149 Kbps
Download: 440Kbps
Upload: 66 Kbps
Download: 651Kbps
Upload: 55 Kbps
Download: 543Kbps
Upload: 174 Kbps
Test 3: Photo uploading
AT&T 12 seconds
28 seconds
15 seconds
4 seconds
Verizon 8 seconds
9 seconds
8 seconds
5 seconds
Test 4: Loading a Web site
AT&T 33 seconds
28 seconds
17 seconds
12 seconds
Verizon 10 seconds
66 seconds
12 seconds
11 seconds
*Measurements taken from Root Metrics test.

As we mentioned, AT&T bested Verizon in just two of our iPhone tests--loading a Web site faster at Treasure Island (the Verizon iPhone hung for over a minute) and uploading a photo to Facebook from our Twin Peaks test spot. In all other tests, Verizon came out ahead, but not always by much.

Verizon blazed through AT&T's upload and download speeds, according to the Root Metrics tool, with the largest performance chasm taking place in CNET's garage. But more important than the results of a diagnostic tool are the real-world upload and download speeds we conducted using Facebook and, and in these tests AT&T's iPhone fell less behind.

Updated at 1:50pm PT to add more detail about AT&T's coverage.