DZone
When connecting an iOS or Android app built using Expo to your data endpoints hosted on your localhost, you might hit a couple of roadblocks in terms of connectivity. This article covers ways to fix that issue in the subsections below.
SAME Wi-Fi
Talking about the obvious, you need to make sure you are connected to the same Wi-Fi on both the device and your machine, so that 192.168 means the same thing.
Source: DZone