Does and iPhone 3GS have built-in internet?

I want to buy an unlocked iPhone 3GS, but I don't want I plan. I was planning to get the app, TextPlus, and just use it as a phone for free. However, I know that TextPlus requires an internet connection for it's uses. Does the iPhone have internet built-in, like Airplane Mode, or do I need to make it a hotspot? I hope you get my question. Just so you know, I want to use it as a phone even when I'm not in Starbucks or McDonald's or something…

Added (1). So I can use it without a Wi-Fi connection? By the way, sorry if I sound stupid…

Added (2). So I can use it without a Wi-Fi connection? By the way, sorry if I sound stupid…

Yes it had 'built-in internet'. Definitely not the same as Airplane mode. Airplane mode essentially turns all that off.

All iPhones have some form of internet connectivity option built in. Airplane Mode has nothing to do with the internet, in fact it disables the internet connectivity using it.

Problem is Wi-Fi is not available everywhere you go & since the iPhone is a smartphone it will be detected on a network and a data plan be applied. Oh & buying an unlocked iPhone wouldn't matter in this case since you want the phone to not be on any carrier.

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