How to fix a picture to make it more clear?

I took a picture on my iphone and had to zoom in a lot in order to get it, and i was wondering if there was any program or something like that to clear it up.

Limitations on cleaning up, or sharpening, or focus, or repixelating details,

if you were looking for tools on iPhone it may not be adequate to detail as would photoshop on desktop or plugins,

http://appadvice.com/applists/show/photo-editing-apps-for-ipad

Adobe Photoshop Express
https://itunes.apple.com/...75235?mt=8
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Oneperiodic Back in focus
https://www.oneperiodic.com/products/backinfocus/

Focusmagic Sharpen Your Blurred
http://www.focusmagic.com/

FocusFixer V2 Home
http://www.fixerlabs.com/EN/photoshop_plugins/focusfixer.htm

Perfect Resize 7
http://www.ononesoftware.com/products/perfect-resize/

Alien Skin Software: Blow Up 3
http://www.alienskin.com/blowup/index.aspx

BenVista Photozoom Pro
http://www.benvista.com/main/content/content.php?page=ourproducts§ion=photozoompro_1

Akvis Refocus
http://akvis.com/en/refocus/index.php

http://photo.net/learn/digital-photography-workflow/advanced-photoshop-tutorials/sharpening/
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Yes you can make picture clear with the help of Photoshop. There are different kinds of tools which helps you to make your picture clear.