3G data speeds
So, I'm looking at buying a sim card from Simple Mobile and then buying the Google Nexus 4. I was looking at the $40 plan that gives me unlimited voice/text but only 250MB of 4G data. I assume that after that 250MB is used up you will drop down to 3G speeds. What are those? Can I expect 500kbps +/-? Currently I'm on MetroPCS and am getting around that as an average. I understand that 3G CDMA and 3G GSM are different types of networks, but the speeds should be about the same, right?
Anyway, any help is greatly appreciated.
My Android history: LG Motion 4G, LG Optimus M+ (rooted), LG Optimus M (rooted with various roms but always came back to Reppard's CM7), Archos G9 80 250GB