I have T-Mobile's 4g slide, which is made by HTC. I like it enough, it's fast and I enjoy being able to do stuff on the phone. I will say that the battery life leaves a lot to be desired but really that seems to be a problem with all smartphones, this particular phone's battery life is average for a smartphone. I have a physical keyboard and while I like it well enough the keys are on the flatter side, which makes it harder to type sometimes so I wish that the keyboard was more responsive like the G2 google phone T-Mobile had before.
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