Thank you. This covers AP to AP handoff. Im more interested in handoff to cellular networks. This would require interconnections with the MNO networks like Verizon, AT&T, or TMobile in the USA.
The best way to test how a device will roam (between APs and cellular) is by using a bit of software called nOversight - it works by pulling the logs directly off of the iPhone.
It's best using macOS connected to an iPhone but there is also an iOS app that you can use.
For soft handoff between cellular and WiFi you need a connection between the cellular core network and the WiFi controller. For authentication and coordination of the handoff. I thought this was an idea that was getting traction a few years back but maybe it never went anywhere.
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