You are downloading the AreaCodes XAP file v188.8.131.52 for Windows Phone. AreaCodes is a free and useful Books & Reference app: This app allows you to quickly do a lookup on area codes for North America. Tap in the 3 digit code to get the area code state/province and cities it ... You can now download the offline XAP file to install & try it.
Download Locations for AreaCodes 184.108.40.206 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline AreaCodes XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.