If you buy a sim-free iPhone, can you still get 4g?

I want the iPhone 5c for Christmas but on the website I'm looking at (Apple & EBay), they're sim-free. Could I put my old Vodafone SIM card in and get 4g, (my old phone wasn't 3 or 4g.)'if not, where would I get 4g from, thank you

Make sure the phone is SIM-free unlocked and you won't have any problem with 4G. Your SIM is fully capable of 4G, your old phone just didn't have 3G or 4G capability. If you need iPhone 5C SIM-free factory unlocked at reasonable price, mail me.

Yes. Its the phone that matters here, whether or not it is 4G capable not if it comes with a SIM or not.

Yes but no

  • When traveling, can I buy a SIM card to my iphone even though I'm still on a contract? I'm traveling soon. I have verizon and their roaming service is very expensive. I was wondering if once I get to my destination country, can I buy a SIM card so that I can be able to obtain phone service while on my trip? If not, My iphone is still under contract, if I get my phone unlocked, then buy a SIM card, would that also be a problem?
  • If you take the SIM card out of an iphone can the police/ family still track you? So I watched this movie called SALT it's not that old but it's a good movie. In one part she takes the SIM card out of the phone so no one can track it. But is that also true with iPhones? Like of you take the SIM card out can the police still track your phone. Because I was think yes because it has your number. But is that true? It's not traceable if you take the SIM card out. But if not is there a way and how?
  • If you buy an iphone unlocked can you still use it over Wi-Fi? I want an iphone but I don't wanna have to get a data plan and pay like $100 a month with Verizon! So i was wanna get a used one off ebay then get a little mobile hot spot thing from Virgin Mobile (http://www.virginmobileusa.com/mobile-broadband/mifi-2200.html) and only pay $35 a month and call? Text with this app (http://itunes.apple.com/us/app/text-free-real-phone-number/id470580739?mt=8) called textfree! So would I be able to do it or not?
  • If i get a unlocked or sim free iphone Can I use any sim? Okay my moms is supposed to be getting the iPhone 6s and I live with my dad but I supposed to be moving back with her soon the thing is they have different cellphone company s. Anyways if I get the sim free iPhone will I be able to just put a SIM card in it without haveing to change contracts threw the phone