Why won't 2G connection work on my Micromax Canvas Spark 3?

mera Micromax canvas spark 3 phone.may isme net use korta hu.3g net good working,but 2g net not working my phone.please give me a solution .

I believe the default set up on your phone is that 3G is the preferred network type. Why are you worried it's not working on 2G? 3G gives better connection.

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