Can QT application detect which type of connection is used?

[anda_skoa]

can a QT-Symbian application detect which type of network connection is being used on the device e.g. 2G/3G/Wifi?

QNetworkConfigurationManager should be able to help you with that.

can the switching of network from "3G to Wifi" or "Wifi to 3G" hamper the application flow?

Depends on the application. Different types of networks have different properties, e.g. bandwidth, latency. if the application depends on certain values then it will likely be effected. if it is just transferring data in the background it probably won't.

Cheers,
_