Windows Phone 7 skips gyroscope and compass support for now
Brandon talked for Channel9 on theissue, but clarified that accelerometer support is there now, andMicrosoft will also add options to use pivot and panoramiccapabilities for developers by the end of the summer. Meanwhile they are allowed to utilize some open source solutions fortheir applications requiring spatial orientation, but are advised toswitch to the official APIs, once released, to provide uniformexperience throughout the platform.
source: Windows phone
Things that are NOT allowed: