How to fix the No Service error in iPhone 3GS 6.1.3?

So, I have an iPhone 3GS. The previous version of it was iOS 4.2.1, and I'll have to admit that it has been jailbroken.

But now that I've decided that it's time to unjailbreak it, I connected it to the latest version of iTunes and clicked "Restore".So, the iPhone has been restored and updated to the latest iOS that it is capable of: iOS 6.1.3.

Now, everything went well-except for one thing, and that's the annoying "No Service" error. I'm 100% sure that there's a sim card attached to my phone, but even if I've tried taking it out and then putting it back in, the phone can't detect it. I tried activating my phone using the internet, but it says that the activating server wasn't available. I tried the iTunes method, but iTunes said that I can't connect it because it had no sim card.

Yes, I tried searching for a method in the internet, but all of them involved "hacktivating", or activating the phone via hacking materials and potentially jailbreaking it again. I'm DONE with jailbreaking, and I'm never going to go back, but it seems that it's the only way to fix this error.

So, is there any way to fix this error without the means of jailbreaking the phone once again? Thank you very much if you answered.

Added (1). I tried restarting iPhone but the "No Service" problem is still there…

Why won't my brand new iPhone 5C won't connect to my home Wi-Fi?

I just recently bought an iPhone 5C for my mom, along with an HTC One. The 4G LTE seems to work fine on both of them, but my iPhone can't seem to connect to my home internet (the HTC connected perfectly fine). I'm 100% sure I'm inputting the correct password, and it always comes up with the same error: "Unable to join the network '[my Wi-Fi name]'" I've tried turning the phone and router off and on, but it doesn't seem to be doing the trick…

I texted my crush and told him I liked him! No reply?

So I took a chance yesterday and told my crush of two years that I liked him. This guy also happens to be one of my guy friends well until now. But he never replied back and I now feel lame and embarrassed. I know he saw it because he has and showed me his iPhone I saw that he was on Facebook after my message so I know that he saw it. I just feel crushed! I thought he kind of liked of liked me with his actions. He flirt, joked asked me out, teased me, and was not afraid to get close. He even seemed jealous when a new guy came in my life. Like he say oh he is a player and that he was uguly. He also asked me odd questions about my love life. One weird moment with him we were playing hang man and I picked the word love he got all serious and was like I had this feeling that you pick that word. I thought he was my friend I thought he care enough to comment. Do you think I'll ever get a reply at this point?

Unlocked iPhone 5S 16GB All Colors for Sale? - 1

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My iphone 4s drains battery really fast?

I bought a second hand iphone 4s running ios 7.0.4 n it drains battery really fast. I done everything (auto_brightness off, 3g off and many others) but still not working it drains 1-2% every minute.

Unlocked iPhone 5S 16GB for sale?

Brand new factory unlocked iphone 5S 16GB for sale for $640. Please text me at 910.333.4375 to purchase. Payment is accepted through PayPal or direct deposit. I can ship worldwide. Share with your friends!

Are camera lens for iPhone worth it?

Is it worth it to get a camera lens for the iPhone 5s as I will be studying abroad in London next semester and traveling? I don't want a bulky Nikon to carry around and was wondering instead of carrying around multiple devices, if I could bring my small videocamera and buy a camera lens for my iphone? Has anyone used a good one before?

Should I download IOS 7 to my brand new iphone 4?

I just got an iphone 4 for Christmas and I do want to get IOS 7 on it but, I have heard horrible things about how laggy or slow it makes the phone. I was thinking maybe its just because those people have a older phone that they have using for many years, but for me I just got it. So I'm pretty torn when it comes down to it. Also does it take up more memory then IOS 6 because if it does then I will not be getting IOS 7, please feel free to answer with your opinions and personal experience!