HT201699 if both wifi and apn is available,can I force use apn? thankyou.

dear friends:
if both wifi and apn is available,can I force use apn? thank you very much.

The iPhone does this automatically - has since the original iPhone and iOS 1.0 was released 5 years ago.
If you have wi-fi enabled and your iPhone is in range of an available wi-fi network the iPhone has connected with before, your iPhone will connect to that wi-fi network automatically. When leaving the range of the wi-fi network, the iPhone switches to cellular data automatically. This swich back and forth is automatic and seamless for wi-fi networks your iPhone has connected with in the past.
The iPhone will connect to the fastest internet connection available, but not automatcally for a wi-fi network your iPhone has not connected with before.

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