Comparing speed on two or more different devices is not very useful IMHO. The true speed depends on many factors beyond your control, such as device processor, device memory, the connection itself, distance tot he tower, tower saturation etc. Also keep in mind that voice generally has priority over data, but with 3G networks becoming more widespread, I am nit sure that is still the case.
If you want to test two or more devices, you need to do then side by side and use the same process or test. With different carriers, I am nt so sure what you gain from the results, given the above conditions.
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