Manual,indigi 7 inch

Indigo. or Indigi Dana?

https://www.google.com/search?q=Indigo+7.0+inch+phablet+SIM+card+access

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Question edited for clarity.
Question moved from Miscellaneous.

https://www.google.com/search?q=Indigi+G4i+manual

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It is a standard Android tablet so...

Power down.
Press and hold Power button and Volume Up button.
When you see the Recovery Console, choose Hard Reset.

https://www.google.com/search?q=indigi+model+g4i+hard+reset

Android Reset videos

https://www.google.com/search?q=android+hard+reset

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Hi click on tools or settings icon look for back up & reset. and follow instructions ... Cheers

Are you sure that it has such opening?

My suggestion is to do a factory reset it should solve your major issue.

Press it in. It is spring loaded and will jump out after you let it go.

owwww. Google.com search for Google Play Store and download

Android 4.0 manked up the apn controls, unfortunately there isnt a simple 'covers everything' solution. Search the market for 'APN settings' and hope fr the best. Each carrier and phone has a totally different compatibilty list.