To avoid problems use "Airplane Mode" and not rely on turnign roaming (voice or data) off.
Was reading this discussion
https://discussions.apple.com/thread/3939421
These articles say: Airplane mode turns off all radios, and yet you can still attach to wifi. Also, if relying on 'roaming off' note when phone asleep and an app needs data (with no wife) it will use a cellular network. (Sheesh)
which pointed to THIS thread with the pertinent conditions
https://discussions.apple.com/message/20051378#20051378
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