Why can't I connect to Wi-Fi on my iPhone?

So 2 days ago, I was given an iPhone not special. It would connect to my Wi-Fi usually, now it would see it but can't connect to it. I put in my password carefully about ten times and it still says "Unabled to join the network ******" Can anyone help me fix this?

Iphone 5s or macbook pro? Read description?

So i don't know which one i want to buy. I already have an iphone 4 but its super slow, and i already have a lenovo laptop but i really want a macbook. Could i get some help?

Wi-Fi Speakers: which to buy?

I was considering the Sonos Play 5 speakers. I have an apple airport extreme, so can i play Spotify music through that on my iphone 5? Or should i wait for spotify connect speakers?

Can i retrieve photos if I accidentally deleted from my iphone?

I hooked my phone up to my brothers computer and accidentally clicked on something which backed up all my brother's iphone info to my phone causing me to lose all pictures, messages, and music. Is there anyway to get my photos back? I have never backed up my iphone to this computer.

Why I can't unlock the modes on Fifa14 on iPhone?

I downloaded Fifa14 as it was free, then I paid the 4.99$ to unlock the 3 modes but they just gave me this message "Shop currently unavailable. Please check your Internet connection or try again later" and now I can't buy it anymore, the button is "Unlock All"

I tried to remove it and download it again but the same thing is happening.
I even tried to fix this from other country but also they just keep on giving me this message
anyone knows how to fix this?

Thanks in advantage.

Added (1). I can download the games of the week.

IPhone 4S won't connect to Wi-Fi? - 3

I have an iPhone 4S and for some reason it won't connect to my Wi-Fi. It has been working fine until last night. My ipod and other devices are connect but mine won't. I have reset networking settings and reset all my settings and won't work. I have even tried the airplane mode thing. Can anyone help me please

Home surveillance cam iPhone app. GVMT spying?

I saw a security camera advertised in the Xmas circulars for very cheap. It links to your smart phone so that you can watch your property from the convenience of your device.

Since the GVMT has the right to spy on your cell phone activities, does this mean they can also surveil your property as easily as you can? Is that why the cam/phone app is so cheap? The GVMT wants it cheap so that you will buy it and THEY can watch your house?