How would I recover deleted iMessages from my iPhone 5?

I accidentally deleted all my messages to a contact today on my iPhone. I tried restoring backup from my computer, but an error message popped up saying there was not enough room on my phone to restore anything. My computer then proceeded to backup my phone, so I guess that means trying to restore it from the last backup won't do anything. However, these messages do show up in spotlight on my iPhone, so I figure they must be in there somewhere. How could I get them back?

You can recover deleted iMessages without iPhone, if you have made a backup before.

Here is the way you can follow:
1. Connect the iPhone to the computer with a USB cable.
2. Open iTunes.
3. If you have a new or erased iPhone, iTunes will prompt you to restore from backup.
4. Otherwise, Control-click on your iPhone under DEVICES in the left menu.
5. Select Restore From Backup…
6. Choose the backup you wish to sync and click the Restore button.

Get more info:
http://download.cnet.com/...85462.html

Find the program TextPad, which is a free download and install it on your computer. When finished installing, open the program and select "Search>Find in Files…" A new dialogue box will appear. In the "Find What" field, type (without quotes), "newest_message" In the "In files" field just below it, type "**".In the "In folder" field, type the path, "c: Documents and Settings[username]Application DataApple ComputerMobileSyncBackup." Then, make sure that you have "Search subfolders" checked, or else this will not work. Then click "Find."