How does 3G access Internet?

You can use 4g sim in 4g/3g/even 2g phone. … offcourse you can use it, they are making all customer to use 4g simcard for better network reception. Airtel 4G simcard can be used in any mobile , we can use 2g, 3g, 4g(if compatible) not like JIO. it is very easy 1 min work, go to any airtel store with number.

If there is no available WiFi network, a smartphone or tablet can still access the internet through a different system called 3G or (the newer version) 4G , which is part of the mobile phone network (you generally pay for this through a monthly contract).

3G data technology uses a network of phone towers to pass signals , ensuring a stable and relatively fast connection over long distances. The tower nearest to the user’s mobile phone passes data to it.