I have that plan and read somewhere that it's throttled back to Edge I think but I haven't used even 100mb of data yet so I'm not sure. My Samsung Exhibit 4G that came with the plan only has 4G at about 4mb-5mb and Edge at around 127kb so those seem to be the only speed options.
AT&T is doing the same thing to my unlimited plan...after 3Gb I'm throttled to the point that the data plan is useless and the plan alone is more than T-Mobile charges for the entire talk/text/data prepaid package.
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