Is an iPhone 5s good for my first smartphone?

This is my first time getting a smartphone and don't really know what exactly I'm looking for. Obviously I want something easy to use and navigate. Does the iPhone 5s provide that? What are the main pros and cons of it? Please let me know what you think! All answers and opinions are and will be appreciated.

IPhone 4 open the recent apps with one home button click?

I got an iPhone 4 yesterday and sometimes when I try and close an app it will open the task manager is this a hardware issue or another problem with ios 7?

Added (1). I don't think the button feels sticky it feels a bit different to what my old ipad 2 used to feel like and it never does it when i press the home button on the home screen i always need to double click it i will just wait until the 7.1 update and see if it happens after that.

All my iPhone contacts randomly deleted?

I looked at my messages tonight and noticed there were no names corrospnding with them. I checked and sure enough all my phone contacts were gone. After searching everywhere online I finally logged into iCloud on my computer and I see all of my contacts there, how to I get those back onto my iPhone? I'm using a 4S with iOS7

Thanks for any help, I'm not very technical.

Added (1). Also yes my contacts have been turned ON in iCloud the whole time, and I've switched it on and off like a few have suggested, given it time, and still no contacts

JVC KD-R450 not playing iphone 5 music?

Okay, so I got this radio today, and it keeps saying "can't play" when I plug my Iphone 5 into it. I have it on the "USB" setting though. So I'm stumped. Any feedback would be greatly appreciated.

Syncing device with TON of music, what'll happen?

So I have an IPod touch with a lot of my music and all I want to do is put it (music) on my computer so I can than download it to my new iPhone but I read somewhere that if you sync a device with music the music is erased and that Can't HAPPEN! Please tell me what would happen and how I can prevent delete-ery

What EXACTLY does Syncing do?

If I sync my iPhone to iTunes on my laptop, what will happen? Will things get erased, will I still have everything the same, I need to know! Please try to explain it to me as simple as possible. As soon as possible

I forgot my Image lockbox password?

So I have a iphone app called image lockbox that can lock your images and remove them from view but I forgot my password and I have images in there that I it would be a Shame to lose. The thing is there's no password recovery so is there a way to retrieve the pictures and put them back to my photos
Here's the app link https://itunes.apple.com/...08892?mt=8