Why does my iPhone 4s data get throttled over even if I'm on Wi-Fi?

Sorry for the stupid question but google gave me nothing. I have AT&T and I'm over 3GB so my data is being throttled. However, I found that it was even getting throttled when on my home Wi-Fi network. I turned off cellular data and it was almost ten times faster. Anyone have any clue as to why this would happen?

Impossible to get throttled on Wi-Fi

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