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

Is anyone else having these issues with ios 8 on iPhone?

Is anyone else having these issues with ios 8 on iPhone?

Added (1). I'm having some weird glitches ever since installed it on my phone. Like youtube keeps crashing and if I ever want to copy/paste something I have to copy it twice or else it won't paste. I was using facebook messenger the other day and tried to send a link to a friend. I made sure to copy it twice, but instead of pasting the link it pasted an email that I had sent to my professor (which I had never even copied in the first place! Weird huh?). Is this happening to anyone else? How can I fix this

Will the iphone 6 work out the usa?

My cousin went to usa and i want to buy an iphone from usa because its much cheaper however he went to apple store or t-mobile and they said that if he want the iphone unlocked he have to turn it on for 40 days in the is and then it will be unlocked but I've seen on the Internet that people buy it and before turning it on they remove the t mobile sim and the put there sim and it works fine so who's right t mobile or people who tried that?

My iPhone 6 battery won't charge?

My iPhone 6 battery won't charge?

Added (1). now that the battery is dead, i plug it in to charge and it takes about 10 minutes for the charge to kick in, and the battery stops charging at 2%. I need help.

Should I download the cheat thing?

I have downloaded farm story 2 (on my iPhone 5) and I was having fun but now I think it's taking too long to get money to buy things and expand my land. Because of this I searched cheats for the game and a couple of things came up to download onto my iPhone but I'm not sure if it will mess up my phone.

I have an Iphone 4. Should I upgrade to Iphone 6?

My Iphone 4 works fine, except it is noticably slow when performing normal tasks like opening applications or typing. When I type, I notice the alphabelts show up about half a second after i type them.

If someone blocks on you an iPhone, will it still ring if their phone is off?

I tried calling someone who blocked me and the call went directly to voicemail, I tried again from *67 and it did the same thing so the phone has to be off. Usually it does the whole ring once then directed to voicemail, I just assumed it did the same thing even if the phone were off since the call really isn't going through anyway? Could this mean I've been unblocked or does it do that regardless?