Earlier today, a post over at BGR was posted prematurely which revealed that Google is going to open up its Project Fi network to more devices starting tomorrow. Actually, Google is supposed to officially announce it tomorrow but word got out and Droid Life reported about it before the original post was taken down.
According to the now deleted post, Google Fi will allow you to bring phones from Samsung, LG, Motorola, OnePlus, and iPhones in Beta. Google mentions that the full Google Fi experience wont be available to phones that werent designed for Fi.
These phones (Pixel 3, 3XL, 2, 2XL, LG G7, LG V35, Moto G6, and Moto X4), can seamlessly switch between Wi-Fi, T-Mobile, US Cellular, and Sprint towers to achieve well-rounded coverage.
Source: Google Fi
Not all phones are 100% compatible with Fi, so using an iPhone wont get you the quick Wi-Fi/LTE enhanced transition that is compatible with only devices on Android Pie. Still, even without the Wi-Fi LTE hand-off, you’ll have pretty good combined coverage from three LTE carriers and a great value for those who dont use too much data on an individual plan.
In any case, Google hasnt announced this yet, but is expected to at 10AM Pacific time should anything else come up, well update this post.