no throttle. you're cut off from data after using 2GB in your plan month cycle unless you buy the extra 1GB for $10 that month. i have the same plan. i set my Nexus 5 to warn me at 1.5GB of usage (Settings-->Data Usage) so i can buy more data if needed. i only typically use about 1GB/month so i'm not too worried about it. GoPhone data speed and $$$ savings are incredible - along with SIM card freedom and the freedom of no contract.
^^ that's right. Prepaid saves a lot, if you have just one line on an account
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