Yes, your phone will only work as quickly as the network allows. When I'm out and about my phone will switch between 3G and 4G depending on the towers wherever I am.
Yes. My android phone is actually an WiFi hotspot. Meaning, when my wife and I are driving somewhere, she can use my phone as an WiFi hotspot for her iPad allowing her full access to the internet. And, if I'm in an WiFi hotspot I can use it instead of my cell connection if I so choose.
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