Jozmil

I'm looking to start doing some Wherigo caches but not sure what I need. I have a Samsung Galaxy S5 and have downloaded the WhereYouGo app. I understand I have to download cartridges to work through but after browsing to the geocaching.com website, finding the GC number and hitting download the mission I'm taken to the Wherigo website. I assume I chose the device as Pocket PC Device ? It downloads to my phone but when I open Wheryougo and hit start it says No Wherigo cartridge is available.