Why does internet only work for a few seconds on the Samsung Galaxy Core II?

When I on the Mobile Data then for few seconds or a minute the Internet works but after that the connectivity lost.
For again net connectivity first off the Mobile Data and then again On it... this is the problem .. please give a solution. ..

Hi Vivek. Have you checked if you the correct APN settings? Also check if when you connect to internet, check if you still have network signal.

Also, try this: Go to Settings > More.. > Cellular networks > Network operators > choose the operator you're currently with. After this, try connecting to internet again.

Let us know how it goes.

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