Samsung Mobile — Problem in acessing network and internet connection

Address:

Kanpur, Uttar Pradesh

I have purchased SAMSUNG GALAXY CORE 2 in March. I am using Vodafone for internet and BSNL for voice calling. Last few months I am facing problem in using internet and voice call. I live in Kanpur (UP, India). The problem is that there is very slow network connection inspite o[censored]sing 3G sim. I cannot access my network connection. Please provide some help