Can I get a sim card for my iPhone 5c without it having service?

So my iPhone 5c was with AT&T and I got the phone from radio shack. I stopped paying the bill because it was too high. Now my phone has no service so is it possible for me to get a t mobile sim card and start using it?

I'd assume no, as most phones from AT&T require an unlock to be used on other carriers. You can either get it unlocked from AT&T if you have met the requirements, or buy an unlock from anywhere on the Internet. Once it's unlocked, just throw in any GSM SIM (like T-Mobile), and it should work fine.