Why is my iPhone using Wi-Fi now and not LTE like it was before?

I got my first iphone about a month ago. It said that it was using Sprint LTE (supposedly faster connection).
I hooked it up to my MacBook Air and it updated the phone right there. Now it's using my house's Wi-Fi.
My question is… WILL MY PHONE GO BACK TO LTE IF IT CAN'T FIND Wi-Fi SIGNAL?

I'm new with all of the Apple products and syncing them together.

And another thing. I'm downloading music into my laptop. How do I transfer it to my iPhone?

How to sync facebook contacts to iphone 4s? - 1

I've read that you can go to your friends list and click sync friends but now the only option is to "find friends" which doesent do anything. All I want is to have my facebook friends numbers saved in my contacts… Any ideas other than the the sync button I don't have,?

What are the cheapest unlimited data and messaging iPhone 4S plans?

I'm getting an iPhone 4S soon but my mom wants me to look for the cheapest plans possible that have unlimited data and texts. I don't call people that much so talk time doesn't need to be a lot. I know you might be thinking that I'm just one of those stupid kids whose parents buy them whatever they want, but I'm not. I've gotten good grades for a while now and as a late birthday present my parents are letting me get an iPhone. I don't want the 5 because its too long but I'm totally fine with the 4S. Anyways, thanks in advance. Also, my mom said to look into no contract plans I think. Could you explain that to me?

Fair price on iphone 5 and note 2?

I'm going to start buying and reselling iphone 5s and galaxy note 2s. I'm going to use Craigslist to buy then resell on ebay. You have to think tho ebay takes a 9% seller fee so what price would make me comfortable paying for the following.
Iphone 5 16gb
Iphone 5 32gb
Iphone 5 64gb
Galaxy note 2

What's the best all-in-one email?

What's the best email? Here's some features I need:

-integration with my iPhone 5
-easy to use calendar, also no email-calendar-alerts like MSN spamming me emails every day
-hopefully integrates to other useful site like Youtube (Gmail)
-best one to run a website with
-amazing sorting features---i'll need to easily identify personal, business, etc.emails

I'm thinking Gmail but is there anything else?

Good slideshow/movie maker website?

I used to have this app called Splice on my iPhone and I loved it. It allowed me to add photos, text pages, videos, music and everything I wanted easily. It started crashing a lot everytime I tried to watch the videos I made and I want to find an easy free website similar to that. Please please help me! I want to make a slideshow/movie for my boyfriend of us.

How do facebook contacts work on iphone 5?

This may be a little confusing to explain. On the iphone 5 if you have the facebook app, along with your regular contacts, your contacts from facebook are listed. Now, if you are in the normal text messaging app and you go to your contacts you have the option to select a friends "facebook contact". My question is, when you send something to that facebook contact via text, where does it go? Is it meant to go to their phone, email, or timeline? I'm asking because earlier I accidentally clicked a friends facebook contact and sent the message to that rather than their phone contact while having a private conversation. My concern is that it is going to be public-so far it hasn't showed up on either one of our timelines and I'd also like to know for future reference. Hope this made sense! Haha!