Earlier this year, we devoted a week of testing to compare the iPhone 6 with the Samsung Galaxy S6, and the Samsung Galaxy Tab 4. You might expect the iPhone to be the fastest for all providers, but it was true only for T-Mobile downstream. Below are graphs comparing the mean downstream (sending) and upstream (receiving) speeds for each (in blue), as well as the average standard deviation (in red).
We found that the GPS readings for the iPhone were slightly off. We know this, because all three devices for the four providers were tested in a stationary location each time. The plot above shows how some of the iPhone locations appear slightly off from the others.
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