!URGENT! App that tells change in network type?

Hi!

Sorry for the urgent, but my company (where I work) is changing mobile phone company and we want to test the connections/roaming "out in the world"

I'm trying to find an app which can tell me (with use of a log) when the phone is changing between 2G, 3G and 4G/LTE.

So far I've downloaded:
Network Monitor (the yellow icon)
2G 3G 4G LTE Network Monitor
Network Cell Info Lite
Network Signal Info Pro (yes, I bought it)

But I don't feel I got the right app yet -.-

Any help to what app can do what I'm looking for?

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