How to completely delete BBM off my iphone?

I want to sell my iphone and swap it for a better phone and usually phone shops will resell the phone second hand. If whoever buys it decides to download BBM for iphone then it will be my BBM account with all my contacts regardless if the memory of the phone was cleared because BBM contacts are stored somewhere else. How do i get rid of BBM completely so if someone buys it next, then they aren't using my BBM account with my contacts? Is there a way to reset your pin so when the app is downloaded again then it'll generate a new pin?

Not so. Follow these instructions, remove your iCloud and you're done. Just remember to remove the sim card before you trade in.
http://ipod.about.com/od/iphonetroubleshooting/ht/Factory-Reset-Iphone-4.htm
See for yourself, there's nothing on there after you do this… Best luck.

It should not be like that, if they sign in with their Apple ID account, they should not get your BBM account.

Uh, no. That will not happen. Just restore the iPhone in iTunes, which would clear it out completely & that's it.

Once someone else buys it then they sign in with their Apple ID, buy/download BBM & go on with their credentials. Yours would not pop up for no reason.

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