It looks like it is from Fort Thompson Indian Reservation in South Dakota using a Google search. The number keeps popping up in my device usage but I have never called it (not anywhere in my log). ¿Qué está sucediendo? Spoofing?
"Greeting, If you have downloaded YouMails Voicemail app onto your iPhone or Android phone, you will see this phone # on your phone bill! Instead of using your regular voicemail provided by your carrier, your voicemails get forwarded by YouMail so you can listen to them in the app. It's a really cool app! I've had it over a year with no problems and you can do all kinds of things with it. If you don't want it, just delete the YouMail app and dial the # YouMail provided in the app to cancel the service."