My Iphone 4 only connects to my home Wi-Fi router when i'm close to it. Why?

Hi

Iv had my Iphone 4 (NOT the s) now for around 12 months and as of recently, the internet started to play up on it. At first I couldn't connect to my home router (sky) so after having a play with the button on the router (switch it off then on, Reset etc) it still wouldn't find the router even when i'm in the same room.

Then I found that if i was within 1/2 metres of the router the iphone would pick it up, connect automatically (like it used to) and it would have full signal!

Does anyone know why this is or what's wrong and how to fix it?

It appears to be the phone at fault as my friend who lives with me has an Iphone 5 and his works fine all throughout the house.

Any help would be appreciated.

Thanks

Added (1). Iv tried resetting the network config on my iPhone and re entering the router details. It finds it. But then I need to be close to it to pick it up.

IPhone 4 stuck in constant reboot cycle (not jailbroken)?

A few days ago, I shut down my iPhone 4 and attempted to reboot it. Upon rebooting it, however, I found out that the lock screen was frozen. I tried to do a hard reset, but had no success. The iPhone would only start up (apple logo would show for about 10 seconds) and then freeze at the lock screen. I attempted to restore the iPhone, but I'm having the same problem. The iPhone is now in this extremely frustrating cycle: (1) Reboot (2) Frozen restore screen (3) Black screen. Even worse, the iPhone is doing this by itself, whether I attempt to turn it off or not. I don't know if anyone else has had a similar problem, but I'd really like to figure out what's going on. My iPhone is about a year old, has no water damage and has not been jailbroken. It was working well until I tried to turn it off. Any help is appreciated.

Cheapest place to buy an iPhone 4?

I live in Australia and I want to buy cheap iPhone 4. I have found ones for $350 second hand. But is there any where I could get one cheaper (besides eBay)? I don't mind if it is second hand, as long as it works and is not terribly cracked.
Cheers

IPhone 5 on T-MOBILE Wi-Fi PROBLEMS?

I have had the iPhone 5 from T-Mobile for almost a month now and still can't get WI-FI at home. I entered the wrong password the initial first two tries and after that I had remembered the password and will now always say "Unable to connect". I have tried turning it off and on as well as the router but no luck. Took it to T-Mobile and the re-booted the network but still no luck. What should I do now? Ask for a new iPhone 5?

Switching from iPhone 5 to galaxy s4?

I currently have an iphone 5 but I want to switch to a galaxy s4 if I do that will I have to buy the galaxy s4 at full price? O and I have sprint && I didn't get my iphone from sprint if that makes any difference

How do save photos via internet on iPhone?

So I'm looking for an app that I and use to save photos on (with an iPhone) have around 1500 pics on my phone and only 16gb storage, and it isn't enough anymore. I realize that I can just connect it to iTunes and save the photos to my computer, except I want to be able to have the pics available to me when I don't have access to the computer, if I want to use one as a backround or to edit or something. Also I need it to connect to internet so if my phone crashes I won't loose everything! Something like Instagram ( I don't care if its social media) except without it cropping the photo!

How to track my iPhone 4 without any apps or iCloud activated?

My iPhone 4 got stolen over the weekend and I want to be able to track it. I have no Find My iPhone apps or iCloud activated. Is there any other way that i can track my phone? Any online softwares that can help me? Like serial numbers? Imei number?