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Can't you stand up your own test network for that? Other phones won't connect to that, so you don't need to fully rf isolate, as long as you have some trust in the test network not doing crazy things. It's well over a decade ago, in Europe, and I was only very peripherally involved, but it didn't seem that hard to get permits for such a test network indoors.

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I think the problem is, 911/112 calls are routed through the best cell network available. This means that if somebody is close enough to your lab, their phone would still try to use your femtocell.

From very dim memory: I think there's some flag you can set that marks your test network as not suitable for that kind of thing. But even if not, IIRC you can set routing information for stuff like 911 on a subscriber basis in your test network - which you'd just do for the handset you're testing.

In that case, you'd just be changing yet another variable and not test the emergency mode of the modem - which might actually be broken due to a software update, right?

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