Was I never getting true 4G on my iPhone 4S?

I recently purchased my Grandpa's iPhone 4S that he used on AT&T, and when I first started using it, the carrier said AT&T and 4G, but as soon as I updated the carrier settings, it went to TFW (TracFone Wireless - using this phone on Straight Talk) and 3G. Does this mean I never really was getting true 4G? I'm not disappointed about this, just clarifying.

The iPhone 4S does not have a 4G antenna, it's a 3G only phone.

It's not possible to get 4G with the iPhone 4S.

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