How to resolve problem of slow internet speed on Samsumg mobile

Fed up of the slow Net connectivity of your Samsung S Duos smartphone? Let our experts explain how to overcome this problem.

I bought Samsung S Duos 1 year ago with 700MB RAM. I used 3G networks of Airtel and Vodafone but the problem is I cannot get good internet speed at all (some times upscale and down scale or stopping for 5 to 4 minutes). Hence, please suggest me what would be the problem. Is it due to low processor of the mobile?

Also, please suggest to me what will be a good phone to buy which is having good processing speed?