The RAM high strength composite cradle is designed to hold the Apple iPhone 4.
The holder has the necessary cut out in the base to allow all cables to remain connected. Full access to the volume, mute, and headphone jack is allowed.
If you're after a mount to hold your iPhone in its case, have a look at the RAM-HOL-UN7BU.
This mount is not suitable for the Apple iPhone 3G or 3GS - please see RAM-HOL-AP6U for suitable mount.