I am not entirely sure what you are asking, but I will take a stab at it.
I am assuming you would like to surf the internet on your tablet by using your phone's 3G / 4G connection. This cannot be done automatically since your phone is not acting like a wireless connection for other wireless devices to connect to.
Your phone must be able to create a wifi hotspot. That will allow wireless devices to detect your phone as a network and use the phone's 3g /4g data connection to go on the internet. Not all phones can create a wifi hotspot; you need to find out if yours can.
If your phone is capable of creating a hotspot, then you might need to activate it by calling your carrier and pay an additional monthly fee.
If you have Verizon as...