What exact information are you looking for?
If you are looking for information on phones that are configured you can do that from the System Administration Page -> Device -> Phones.
You can leave the Field Blank and it will return all phones or you can search by Directory Number, Description or Device Type among other criteria.
If you are using Extension Mobility you have to go to Device -> Device Settings -> Device Profiles. Here you can search for all the device profiles used for Extension Mobility.