Is it worth replacing my cracked iphone back before i sell it?

I have just got the iphone 5 and i want to sell my iphone 4 to mobile exchange they offered around £130 for it in working condition but when i emailed and said it has a small crack on the back they said the price could go down to £46 depending on how bad, but i need to send it off for them to asses. My question is, i can get the back repaired for £15 and then send it off, but will this be cheaper then sending it with the damage? Anyone had the same problem? Cheers!

£46?

You would get double that on eBay at worst
Lol I would give you £60 for it

You can repair the device and sell it a great profit for your self. We can get you the proper parts, tools and step by step videos so you do not have to pay anyone to do the labor for you. For immediate assistance, chat with us on our site.

Yes you can, check the below, a UK company and fast shipping with A+++ work

  • Should I take my sim card out before I sell my iphone? I just bought out my contract from my phone carrier and got the phone unlocked, and now I want to sell it. So should I take the sim card out when I sell it or leave it in?
  • Should i replace the back of my iPhone 4 before i sell it? It cracked last year, but I just put a screen protector over it and continued using it. Now my contract is up, and I'm selling it&getting the iPhone 5. Should I replace the back glass (since its easy to replace) before selling it, or would that cost more? Which would be cheaper?
  • Replacing the Back Housing of IPhone 5s. Possible Services? I want to replace the rear housing of my new iPhone 5s. It isn't broken, but I really would like a different color backplate. I know about the do-it-yourself kits available online, but I'd prefer a more experienced technical professional. What kinds of services could I contact for help with this?
  • Replacing iPhone that had a cracked screen? I recently dropped my iPhone 5 and cracked the screen I have insurance on the phone with att so I can replace it for $200 but my question is will I lose everything on my phone (bookmarked websites, pictures, notes ect.)? If not so do I transfer them from my old phone to the new one I get?!