Hi Iris730,
thanks for your report, what kind of phone and Android version do you have? We don't in any way touch the phone's radio regarding making calls or sending texts. We just disable mobile data, but the GSM connectivity shouldn't be affected.
We have reports about Wifi sometimes getting stuck (not being able to enable/disable it, even manually), and that's unfortunately Android issue, that just gets more apparent, because we switch the Wifi more often than a user ever would.
We also had reported that on some phones the Wifi isn't turned ON after we turned it OFF, but weren't able to reproduce it, even on the same device model and same Android version.
Ondra