So idk if i'm just really late but I remember a while back I was looking for a app like the iphone and android has, and when I had the hero for a short sec I loved the bluffmycall app.....well I found on for windows mobile that works and lets you call as many times as you want for free. a 2 min fone call but it's free. It's kinda tricky to find it once installed.
Go to file explorer/ my device/ program files/ bluff
The file is in there and if you want it in the start menu you have to copy the shortcut to the folder ( file explorer/ my device/ windows/ start menu/ programs
Once you start it go into setting and type in your number then you are all set!!!!! if this helps THANK ME PLEASE
WOrks on 6.5 so it should work on 6.1