I left T-Mobile in Phoenix because of high latency. If using any real-time apps, you'll notice a delay regardless of speed. I tether my laptop for work, and connect to a remote ssh Unix console all day long. 1000ms+ ping causes a delayed response (1 sec per character typed to be exact) when typing in this situation. If you had any multiplayer games or video chat, you'd notice a maddening delay with those as well. I was using an HTC One S, and I never got a chance to see if any other phones operated any differently. I was thinking of coming back, but not until they can show me the latency is fixed.
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