Iphone beta app won't delete?

I recently downloaded an app that is not through the app store and is in beta. It uses a username and password to be installed which were given to me by the creator. I decided the app wasn't for me and deleted it. Then the next time i unlocked my phone the window asking for the username and password for installation popped up again. I hit cancel and the app reappeared on my phone. I've tried multiple times to delete it via the phone and even another few times through itunes. I've tried turning the phone off and on but nothing works. I absolutely can't delete it! Not to mention my phones battery has been draining significantly faster since i first downloaded the app. What should i do? Do i need to completely restore my phone?

You should be do jailbreak for deleting iphone beta app. Because of it is preinstalled apps and most of pre-installed apps are not deleted without privileges. I found one official site which is unlock iphone means jailbreak. So I will suggest you to go through it.

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