I will be needing to rent a phone for my trip on Monday. My girlfriends grandma is not doing well and I feel really bad about going but she insisted that I go. I want to be able to stay in contact with her if something happens and I can go back home. Where can I rent one and how much do they cost? (5day trip)

They are cheap to rent, about $40 a week plus air time. Google it there are many companies. I can not recommend a particular company to rent from. They send it to you, don't know about getting by Monday. I wouldn't use anything but iridium satellite equipment. I know Piragis in Ely also rents them.

Piragis
https://www.piragis.com/partial-outfitting/canoe-rental-partial-outfitting.html
Near the bottom of the page.

Many outfitters rent these but those service you find on google will be less or much lees expensive.

Thank you very much! Too late for me to get one online so I will call an outfitter today and check on them.

This place will ship overnight: http://www.networkinv.com/services/satellite-rentals/

This will do next day: https://www.globalcomsatphone.com/product/480-iridium-9500-satellite-phone-rental

Both recommended from an outfitter so seem somewhat legit. https://www.seagulloutfitters.com/satellite-phones/