My contacts suddenly vanished(IPhone 4)?

So I didn't even do anything with my contacts and received a message from a number I didn't recongnized and later opened it to see I messaged that person before and it was my friend. Then I realized all the people I messaged didn't have names and I looked at the contacts and it said no contacts. I have iOS 7, and haven't updated for a few months now. I'm just wondering why it did that and how I can get the contacts back.

Two accounts on 1 iphone 4s phone?

My girlfriend just got an iphone 4s and she might sell it bc she doesn't like it so i gave her my information to login to her new iphone so she can just test it out so she doesn't have to set up a new account… Anyways once she signs my user name and password on her iphone will it notify me on my iphone that someone is signing it? Will it allow it? And will she see all my text messages even from imessage and phoTos? Will it show her all my deleted text messages? Once she setups her iphone using my account information and she synces everything will it synce all the contacts and messages and pictures? Just curious to what all will happen i don't want it to lock my account or anything i'm okay with her useing my information or seeing my stuff.

My iphone 4 charges very slow and dies very fast?

Hi, I only noticed this a few days ago, I had it on charge for about an hour and it only went up to 20% and yesterday I had it on 39% and I quickly popped shops, 15 minutes later I looked at my phone and it was on 5%. I really don't understand why, I always let my battery run down before charging it to the max, I haven't downloaded anything recently. Normally aswell, as everyone knows when the battery is completely dead and you charge it, it turns on within 5 minutes and it has a little bit of power. Mine don't, it takes half hour to switch on and is only on 4%?

What's mobile data current period?

I've just got an iphone 5c around 5 days ago and i had 750MB and priviously the company sended me a text saying that i only have 51MB left, but then i go on my settings in the mobile and i see 'current period' and it says '473MB' what is that is it how much i've wasted so i have like 200MB left if thats what it is why did they text me that i only got 51? Can please someone explain what current period is please?

How to enlarge a photo without pixelation?

I saw an amazing bird on my neighbors roof and wanted to identify, so I snapped a quick picture with my iPhone 4s before it flew away. Unfortunately when I zoom in it's not clear enough to identify. I knew this would probably happen with the camera I was using. The actual image width is 2448 pixels and the height is 3264 pixels. The horizontal and vertical resolution is 72 dpi. I have adobe Photoshop CS6 if anyone knows how to zoom in without pixelation please let me know. I've attached the picture. The bird is next to the chimney on the roof. You can just make out it's grey figure. That's what I'm trying to get a clearer image of. If anyone knows how I can do that clearly I'd really appreciate some help! Thanks so much!
How to enlarge a photo without pixelation - 1

How much would this used iPhone roughly cost?

I have an iPhone 5 black 16gb that I'm selling, a guy on ebay has offered me £125

some faults with the phone.front camera not working.phone lifts a bit at the top left corner.small deep scratch on the back panel.small crack on the front.excessive wear and tear.volume down doesn't work

other than that the phone completely works, how much do you think I could get for this phono, should I accept this guys offer?

Companies filing for bankruptcy?

I would like to find a website or database, list or maybe an app for my Iphone with information about companies filing bankruptcy that trade publicly in the stock market.