Does a iPhone have to be activated to get apps?
You would need to have an iTunes account.
What if you have apps on your iphone and some apps on your computer but not all the app on your iphone are on the computer can you still sync them to the phone wihout the other apps been deleted?
If the applications are downloaded via iTunes, they will be automatically transfered to the iPhone during synchronization. Otherwise, the apps downloaded via iPhone will be copied and backed up to the iTunes during synchronization. So to transfer the apps to the iPhone, just connect the phone to the iTunes and sync. Click on iphone on the side bar, then apps up the top, then sync apps.
This can be for a couple of reasons: The software on the iPhone is outdated, and all of the apps require a higher version to work. The software on the iPhone is too new, and all of the apps have not been developed to work on it yet. You have jailbroken your iPhone, and you downloaded bad apps through the jailbreak. You just didn't download the apps correctly, and you need to delete the ones…
You unfortunately are not able to . . You can delete apps that you have downloaded to your iPhone, but not the apps that are rooted in the factory settings of the iPhone. However, there is a way of moving the original apps to another area, which gives the appearance of the original apps being removed .