How to solve the 'SIM Card Invalid' problem with my iPhone 5c? (updated with 7.0.5)?

Okay so My iPhone 5c was working fine and the SIM card was working as it should. Then the next morning it started saying either 'No SIM', 'Invalid SIM', or 'SOS only'. I have tried putting it in and out and I also restored the phone like Apple suggested. But now I can't activate the phone as you need a SIM installed to do so. Is there any suggestions on how to fix it, or do you think it might just be the actual SIM reader in the phone? (and need to claim insurance) Please Help!

How much I should sell my iPhone 4 with accessories for?

I have an iPhone 4 that I'm selling as I just got the 5. It is used but in good condition except the battery is now faulty but I'm purchasing a replacement for it, although not fixing it myself as I wouldn't feel comfortable doing it because I'm terrible with technology.

This is exactly what I'm selling:
iPhone 4 - used in good condition
Charger (with the USB)
Charger case
3 standard plastic & silicon cases
Simple docking station
Replacement battery with the tools to replace it

I'm selling it to my boyfriend who will know what he's doing with the battery replacement. I want to know how much this is worth so I can decide on my own price that's appropriate for someone close to me. Obviously I don't wanna just give it away but I don't want to overcharge him and I have no idea how much these things are worth!

Answers are much appreciated, thanks.

Can I buy an Iphone 5c without a contact?

I want to buy an iphone 5c 16GB, it costs $99 and I already have my own carrier (SIM AT&T). All I really want to do is to replace a phone on my account with a new iphone, that's all I want. So if I just buy an iphone 5c without a contact and just want to replace this phone, I just have to pay the store $99 right? I mean tax and everything. I was just wondering because I Really want to buy a new iphone without paying the AT&T every month because I'm a student. I worked my AASS out to buy a new phone.

Should I buy the Gold or Silver iPhone 5s? - 1

Should I buy the Gold or Silver iPhone 5s? I love both and I can't decide between them. I don't want any regrets with the color i buy because I definitely regret buying the black iPhone 5.

Which looks best with cases? Which do you prefer?

Can I SIM Unlock my jailbroken iPhone 4s with a Cydia source?

My friend gave me her old iPhone 4s after she got the iPhone 5s but she has AT&T and I have T-mobile. I have the original AT&T SIM card and a T-mobile micro SIM that fits in the iPhone. Is there a Cydia source that I can get that will unlock it? OR any other FREE way to unlock it?