Is the mobile data (2G, 3G or LTE) transfer automatically off when wi-fi activated? Do I have to turn mobile data off manually?

Is this process automatic?

The process of transferring between the type of cellular data connection available at the time and between cellular data and an available wi-fi network and back again is automatic.
Cellular data access is not turned off when connected to an available wi-fi network and vice-versa. Visual voicemail messages are downloaded to the iPhone via a carrier's cellular data or internet network only even when the iPhone is connected to an available wi-fi network when not answering the phone and the caller leaves a voicmail.
If you want to turn cellular data off when the iPhone is connected to an available wi-fi network, you must turn Cellular Data off manually.
If you want to turn wi-fi off when the iPhone is not connected to an available wi-fi network, you must turn wi-fi access of manually. 

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