4G is the new next-generation of cell phone network speeds.
Technically, 4G means “4th Generation network.” Yes, the ads promise it to be faster, better, etc.,etc.; but should you care?
The short answer is “not really.”
The long answer is if you are an average user with a non-smart phone, this wont matter to you.
If you have a smart (Windows, Android, or i) phone, the speed difference wont be tremendous, and probably not existent anywhere 3G doesnt reach now.
You’re better off using Wi-fi, wherever its available. In fact, most major networks (except Verizon) are expanding their wi-fi networks to handle the expected increase in data traffic.