Is it 1GB or 2GB high speed for "classic" Simple Choice North America plan?

ty2015

    I am in old, very old, Simple Choice North America plan. According to the details of the plan, it indicates "2GB per line", but it also indicates "1GB high speed". This is confusing. What does "2GB per line" mean if it only offers "1GB high speed"??? (And, I did get a text message from T-Mobile when it uses 800MB data, and did get another text message when it exceeds 1GB data, and then, the speed of data drops.)

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