If his wifi is turned off (even when there’s no wifi connected) it can really throw off the location, I had my wifi turned off the other day at work (there’s no staff wifi and I always use my data but have wifi turned on despite it not being connected so I don’t have to turn it on when I get home) and when booking an Uber home it initially put my location at a 10 minute walk away from where I was, then after I’d booked without noticing it put my location at the right place and I had to cancel it because it was too far away to move the pickup location