Can I use an Iphone without paying monthly?

Say i bought a used Iphone off of ebay and just slipped my non-smartphone's simcard into it, would there be a monthly charge or would it be the normal cost? If I didn't have a data plan I wouldn't be able to use internet wherever I go, but would I still be able to use internet where there's Wi-Fi, sort of like an Itouch? My phone company is AT&T if they helps.

Can you buy a device to get internet anywhere?

Iphones get internet anywhere even way out in logging blocks, I was wondering if you can get a device to plug into a computer that allows you to get internet out in the forest like a phone

Does unlocked on a iphone means in no service?

So i want to switch to t-mobile. I'm buying an used att iphone 4. And i just want to put the sim card something like that. And in every page on tutorials it says it needs to be an att iphone unlocked. But i don't know what unlocked means. Does it means like the phone is from the company att but like in no service? Or what does it means?

Why do fandom blogs hate hipster blogs?

On tumblr, I've noticed like all the fandom blogs seem to be in agreement that the 'hipster' blogs are some sort of massive amalgamation of shoes and iPhones and overly deep pseudo intellectual text that's really meaningless, and I wonder why? Sure, those things do crop up every once and a while, but not often, and why bother with the hate? I mean, 'hipster' blogs largely just leave you alone and don't bother anyone. Can someone fandom-y tell me why this is?