When updating to iOS 7, my iPhone says Could Not Activate iPhone?

I have an iPhone 4s that is not activated; I used to have Sprint, but my service was shut off. I can still use it when I have access to Wi-Fi. I just updated to iOS 7 and was going through setting my phone up. When i got to the step saying "It may take a few minutes to update your iPhone". After waiting, my phone said "Your iPhone could not be activated because the activation server can't be reached. Try connecting your iPhone to iTunes to activate it, or try again in a couple of minutes. If this problem persists, contact Apple Support at apple.com/support". I connected my phone to iTunes to retry activation and searched on Apple Support, but could not find out what was wrong or something I could do. Does this mean I can't use my iPhone with iOS 7 if I do not have an activated iPhone? If so, is there anyway to change back to iOS 6 or get out of the set up screen?

IOS7 will not install on my Iphone 4?

It took 3 hours for IOS 7 to download and now I keep trying to install it and it says "software update is not available at this time. Try again later." I keep trying like every half hour but it won't install!

Is sprint LTE as slow as Virgin Mobile 4g?

I'm going to change my Samsung Galaxy s2 from Virgin mobile and get an Iphone 5S tomorrow at Sprint, Virgin Mobile has an awfully slow connection. I hear they share the same data. Is Sprint as slow as Virgin?

IPhone 4 stuck on iOS 6.2.3?

I think it is 6.something.3.
I had the option to update to 7 earlier, but every time I tried showed an error.
I tried turning my phone on and off, and the internet on and off, still doesn't work.
No answers without a solution please.

What service providers will allow me to use an unlocked iPhone?

My contract is up for Verizon and I have a 4S. I really don't want to pay $110 a month when I'm not leasing a phone. I don't want a new phone, and I know virgin won't let you use an unlocked phone. I want something similar where I only pay around $50 a month for phone/data/messaging.

I phone 4 restore, COULD NOT ACTIVATE IPHONE?

I have an AT&T i phone 4. I went to download IOS 7 and it said i need to clear up space in order to downlaod it. However, my phone only had 5 pictures about 50 songs and one app? So i researched it and found out that i have corrupt data on my phone that its taking up space and you have to restore it to factory settings in order to get that data. So now its telling me that
"Your iphone could not be activated because the activation server can't be reached. Try connecting your iphone to itunes to activate it, or try again in a few minutes".

- Tried connection to itunes get a similiar error.
- Can't access my phone and says no service in upper left hand corner

How does t-mobiles new upgrade system work?

I haven't upgraded my phone since t mobile has did away with the old pay one price for an upgrade for two years. I'm planning on pre ordering the 32 gb green iphone 5c but I noticed there's a thing that says something like, +$21 x 24mo. Or pay full at check out $549.99. I'm confused. Someone help me out please? I don't want to pay per month or 500 at checkout.

What could be the reason why I have no space on my Iphone 4, 8 GB?

I have an Iphone 4 that is 8 GB. I recently just deleted every single one of my apps to make space for IOS 7. I even deleted all pictures and videos and music. It says 4.4 GB of data is still taken up. Where is this 4.4 GB and how do I get rid of it. I have nothing on my phone except for contacts.