Does  the iphone 4s only use 4g or 3g to?

Does  the iphone 4s only use 4g or 3g to?

As far as I know, the phone uses the best available network. That's why you don't have the option anymore to switch off 3G network.
If iPhone is connected to the Internet via the cellular data network, the (UMTS/EV-DO ), (EDGE), or (GPRS/1xRTT) icon appears in the status bar.
The 3G (UMTS) cellular network supports simultaneous voice and data communications on GSM networks. For all other cellular connections, you can’t use Internet services while you’re talking on the phone unless iPhone also has a Wi-Fi connection to the Internet. Depending on your network connection, you may not be able to receive calls while iPhone transfers data over the cellular network—when downloading a webpage, for example.
copied from page 148 iphone_user_guide 5

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