Unlimited 3g on T-Mobile $50 Plan?

I want to use my iPhone 4 on T-Mobile. If I pay for the $50 plan which is 500MB of high speed data, will I get unlimited 3g since the iPhone 4 is only 3g compatible? Or do they refer to "high speed" as the highest speed your phone is compatible with?

If its not a tmobile iphone you only get edge data.
also only 2.5 gb not unlimited

Hihg speed is any data variant better than EDGE (2G). Unfortunately, your phone is incompatible with T-Mobile's 3G network and you will be limited to 2G data only.

You can get unlimited Talk, Text & 4G nationwide data for only $49 a month with no contracts. You can even get it free through Solavei. Solavei operates on T-Mobiles network so it's a no brainer for you! If you are using a phone that is only 3G compatible, you will get unlimited data for that.

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