I am getting error while trying to register on Instagram “An unknown network error has occured”, any help? I have tried registering via wi-fi as well as 3G , nothing helps. I am using a Micromax HD A116 phone with Android 4.1.2
Go to Settings > Data Manager > Data Delivery > Data enabled -- and placed the check mark in its box. Now Market is functioning again. Hope this works for you.
If it doesn't try resetting your phone( backup all data) or try to register from another phone
If by chance you are using open dns to filter your dns queries there is a good chance that is keeping you from accessing instagram, I had a similar issue and was not getting redirected or a blocked message from open dns while using instagram.
Try using a different platform. Set up your account there and then access it with your phone.